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Netflix is a popular streaming service that offers a vast catalog of movies, TV shows, and original contents. This dataset is a cleaned version of the original version which can be found here. The data consist of contents added to Netflix from 2008 to 2021. The oldest content is as old as 1925 and the newest as 2021. This dataset will be cleaned with PostgreSQL and visualized with Tableau. The purpose of this dataset is to test my data cleaning and visualization skills. The cleaned data can be found below and the Tableau dashboard can be found here .
We are going to: 1. Treat the Nulls 2. Treat the duplicates 3. Populate missing rows 4. Drop unneeded columns 5. Split columns Extra steps and more explanation on the process will be explained through the code comments
--View dataset
SELECT *
FROM netflix;
--The show_id column is the unique id for the dataset, therefore we are going to check for duplicates
SELECT show_id, COUNT(*)
FROM netflix
GROUP BY show_id
ORDER BY show_id DESC;
--No duplicates
--Check null values across columns
SELECT COUNT(*) FILTER (WHERE show_id IS NULL) AS showid_nulls,
COUNT(*) FILTER (WHERE type IS NULL) AS type_nulls,
COUNT(*) FILTER (WHERE title IS NULL) AS title_nulls,
COUNT(*) FILTER (WHERE director IS NULL) AS director_nulls,
COUNT(*) FILTER (WHERE movie_cast IS NULL) AS movie_cast_nulls,
COUNT(*) FILTER (WHERE country IS NULL) AS country_nulls,
COUNT(*) FILTER (WHERE date_added IS NULL) AS date_addes_nulls,
COUNT(*) FILTER (WHERE release_year IS NULL) AS release_year_nulls,
COUNT(*) FILTER (WHERE rating IS NULL) AS rating_nulls,
COUNT(*) FILTER (WHERE duration IS NULL) AS duration_nulls,
COUNT(*) FILTER (WHERE listed_in IS NULL) AS listed_in_nulls,
COUNT(*) FILTER (WHERE description IS NULL) AS description_nulls
FROM netflix;
We can see that there are NULLS.
director_nulls = 2634
movie_cast_nulls = 825
country_nulls = 831
date_added_nulls = 10
rating_nulls = 4
duration_nulls = 3
The director column nulls is about 30% of the whole column, therefore I will not delete them. I will rather find another column to populate it. To populate the director column, we want to find out if there is relationship between movie_cast column and director column
-- Below, we find out if some directors are likely to work with particular cast
WITH cte AS
(
SELECT title, CONCAT(director, '---', movie_cast) AS director_cast
FROM netflix
)
SELECT director_cast, COUNT(*) AS count
FROM cte
GROUP BY director_cast
HAVING COUNT(*) > 1
ORDER BY COUNT(*) DESC;
With this, we can now populate NULL rows in directors
using their record with movie_cast
UPDATE netflix
SET director = 'Alastair Fothergill'
WHERE movie_cast = 'David Attenborough'
AND director IS NULL ;
--Repeat this step to populate the rest of the director nulls
--Populate the rest of the NULL in director as "Not Given"
UPDATE netflix
SET director = 'Not Given'
WHERE director IS NULL;
--When I was doing this, I found a less complex and faster way to populate a column which I will use next
Just like the director column, I will not delete the nulls in country. Since the country column is related to director and movie, we are going to populate the country column with the director column
--Populate the country using the director column
SELECT COALESCE(nt.country,nt2.country)
FROM netflix AS nt
JOIN netflix AS nt2
ON nt.director = nt2.director
AND nt.show_id <> nt2.show_id
WHERE nt.country IS NULL;
UPDATE netflix
SET country = nt2.country
FROM netflix AS nt2
WHERE netflix.director = nt2.director and netflix.show_id <> nt2.show_id
AND netflix.country IS NULL;
--To confirm if there are still directors linked to country that refuse to update
SELECT director, country, date_added
FROM netflix
WHERE country IS NULL;
--Populate the rest of the NULL in director as "Not Given"
UPDATE netflix
SET country = 'Not Given'
WHERE country IS NULL;
The date_added rows nulls is just 10 out of over 8000 rows, deleting them cannot affect our analysis or visualization
--Show date_added nulls
SELECT show_id, date_added
FROM netflix_clean
WHERE date_added IS NULL;
--DELETE nulls
DELETE F...
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Sample data for exercises in Further Adventures in Data Cleaning.
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According to our latest research, the global AI in Data Cleaning market size reached USD 1.82 billion in 2024, demonstrating remarkable momentum driven by the exponential growth of data-driven enterprises. The market is projected to grow at a CAGR of 28.1% from 2025 to 2033, reaching an estimated USD 17.73 billion by 2033. This exceptional growth trajectory is primarily fueled by increasing data volumes, the urgent need for high-quality datasets, and the adoption of artificial intelligence technologies across diverse industries.
The surging demand for automated data management solutions remains a key growth driver for the AI in Data Cleaning market. As organizations generate and collect massive volumes of structured and unstructured data, manual data cleaning processes have become insufficient, error-prone, and costly. AI-powered data cleaning tools address these challenges by leveraging machine learning algorithms, natural language processing, and pattern recognition to efficiently identify, correct, and eliminate inconsistencies, duplicates, and inaccuracies. This automation not only enhances data quality but also significantly reduces operational costs and improves decision-making capabilities, making AI-based solutions indispensable for enterprises aiming to achieve digital transformation and maintain a competitive edge.
Another crucial factor propelling market expansion is the growing emphasis on regulatory compliance and data governance. Sectors such as BFSI, healthcare, and government are subject to stringent data privacy and accuracy regulations, including GDPR, HIPAA, and CCPA. AI in data cleaning enables these industries to ensure data integrity, minimize compliance risks, and maintain audit trails, thereby safeguarding sensitive information and building stakeholder trust. Furthermore, the proliferation of cloud computing and advanced analytics platforms has made AI-powered data cleaning solutions more accessible, scalable, and cost-effective, further accelerating adoption across small, medium, and large enterprises.
The increasing integration of AI in data cleaning with other emerging technologies such as big data analytics, IoT, and robotic process automation (RPA) is unlocking new avenues for market growth. By embedding AI-driven data cleaning processes into end-to-end data pipelines, organizations can streamline data preparation, enable real-time analytics, and support advanced use cases like predictive modeling and personalized customer experiences. Strategic partnerships, investments in R&D, and the rise of specialized AI startups are also catalyzing innovation in this space, making AI in data cleaning a cornerstone of the broader data management ecosystem.
From a regional perspective, North America continues to lead the global AI in Data Cleaning market, accounting for the largest revenue share in 2024, followed closely by Europe and Asia Pacific. The region’s dominance is attributed to the presence of major technology vendors, robust digital infrastructure, and high adoption rates of AI and cloud technologies. Meanwhile, Asia Pacific is witnessing the fastest growth, propelled by rapid digitalization, expanding IT sectors, and increasing investments in AI-driven solutions by enterprises in China, India, and Southeast Asia. Europe remains a significant market, supported by strict data protection regulations and a mature enterprise landscape. Latin America and the Middle East & Africa are emerging as promising markets, albeit at a relatively nascent stage, with growing awareness and gradual adoption of AI-powered data cleaning solutions.
The AI in Data Cleaning market is broadly segmented by component into software and services, with each segment playing a pivotal role in shaping the industry’s evolution. The software segment dominates the market, driven by the rapid adoption of advanced AI-based data cleaning platforms that automate complex data preparation tasks. These platforms leverage sophisticated algorithms to detect anomalies, standardize formats, and enrich datasets, thereby enabling organizations to maintain high-quality data repositories. The increasing demand for self-service data cleaning software, which empowers business users to cleanse data without extensive IT intervention, is further fueling growth in this segment. Vendors are continuously enhancing their offerings with intuitive interfaces, integration capabilities, and support for diverse data sources to cater to a wide r
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According to our latest research, the global Autonomous Data Cleaning with AI market size reached USD 1.68 billion in 2024, with a robust year-on-year growth driven by the surge in enterprise data volumes and the mounting demand for high-quality, actionable insights. The market is projected to expand at a CAGR of 24.2% from 2025 to 2033, which will take the overall market value to approximately USD 13.1 billion by 2033. This rapid growth is fueled by the increasing adoption of artificial intelligence (AI) and machine learning (ML) technologies across industries, aiming to automate and optimize the data cleaning process for improved operational efficiency and decision-making.
The primary growth driver for the Autonomous Data Cleaning with AI market is the exponential increase in data generation across various industries such as BFSI, healthcare, retail, and manufacturing. Organizations are grappling with massive amounts of structured and unstructured data, much of which is riddled with inconsistencies, duplicates, and inaccuracies. Manual data cleaning is both time-consuming and error-prone, leading businesses to seek automated AI-driven solutions that can intelligently detect, correct, and prevent data quality issues. The integration of AI not only accelerates the data cleaning process but also ensures higher accuracy, enabling organizations to leverage clean, reliable data for analytics, compliance, and digital transformation initiatives. This, in turn, translates into enhanced business agility and competitive advantage.
Another significant factor propelling the market is the increasing regulatory scrutiny and compliance requirements in sectors such as banking, healthcare, and government. Regulations such as GDPR, HIPAA, and others mandate strict data governance and quality standards. Autonomous Data Cleaning with AI solutions help organizations maintain compliance by ensuring data integrity, traceability, and auditability. Additionally, the evolution of cloud computing and the proliferation of big data analytics platforms have made it easier for organizations of all sizes to deploy and scale AI-powered data cleaning tools. These advancements are making autonomous data cleaning more accessible, cost-effective, and scalable, further driving market adoption.
The growing emphasis on digital transformation and real-time decision-making is also a crucial growth factor for the Autonomous Data Cleaning with AI market. As enterprises increasingly rely on analytics, machine learning, and artificial intelligence for business insights, the quality of input data becomes paramount. Automated, AI-driven data cleaning solutions enable organizations to process, cleanse, and prepare data in real-time, ensuring that downstream analytics and AI models are fed with high-quality inputs. This not only improves the accuracy of business predictions but also reduces the time-to-insight, helping organizations stay ahead in highly competitive markets.
From a regional perspective, North America currently dominates the Autonomous Data Cleaning with AI market, accounting for the largest share in 2024, followed closely by Europe and Asia Pacific. The presence of leading technology companies, early adopters of AI, and a mature regulatory environment are key factors contributing to North America’s leadership. However, Asia Pacific is expected to witness the highest CAGR over the forecast period, driven by rapid digitalization, expanding IT infrastructure, and increasing investments in AI and data analytics, particularly in countries such as China, India, and Japan. Latin America and the Middle East & Africa are also gradually emerging as promising markets, supported by growing awareness and adoption of AI-driven data management solutions.
The Autonomous Data Cleaning with AI market is segmented by component into Software and Services. The software segment currently holds the largest market share, driven
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The global Data Preparation Platform market is poised for substantial growth, estimated to reach $15,600 million by the study's end in 2033, up from $6,000 million in the base year of 2025. This trajectory is fueled by a Compound Annual Growth Rate (CAGR) of approximately 12.5% over the forecast period. The proliferation of big data and the increasing need for clean, usable data across all business functions are primary drivers. Organizations are recognizing that effective data preparation is foundational to accurate analytics, informed decision-making, and successful AI/ML initiatives. This has led to a surge in demand for platforms that can automate and streamline the complex, time-consuming process of data cleansing, transformation, and enrichment. The market's expansion is further propelled by the growing adoption of cloud-based solutions, offering scalability, flexibility, and cost-efficiency, particularly for Small & Medium Enterprises (SMEs). Key trends shaping the Data Preparation Platform market include the integration of AI and machine learning for automated data profiling and anomaly detection, enhanced collaboration features to facilitate teamwork among data professionals, and a growing focus on data governance and compliance. While the market exhibits robust growth, certain restraints may temper its pace. These include the complexity of integrating data preparation tools with existing IT infrastructures, the shortage of skilled data professionals capable of leveraging advanced platform features, and concerns around data security and privacy. Despite these challenges, the market is expected to witness continuous innovation and strategic partnerships among leading companies like Microsoft, Tableau, and Alteryx, aiming to provide more comprehensive and user-friendly solutions to meet the evolving demands of a data-driven world. Here's a comprehensive report description on Data Preparation Platforms, incorporating the requested information, values, and structure:
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TwitterIntroduction: I have chosen to complete a data analysis project for the second course option, Bellabeats, Inc., using a locally hosted database program, Excel for both my data analysis and visualizations. This choice was made primarily because I live in a remote area and have limited bandwidth and inconsistent internet access. Therefore, completing a capstone project using web-based programs such as R Studio, SQL Workbench, or Google Sheets was not a feasible choice. I was further limited in which option to choose as the datasets for the ride-share project option were larger than my version of Excel would accept. In the scenario provided, I will be acting as a Junior Data Analyst in support of the Bellabeats, Inc. executive team and data analytics team. This combined team has decided to use an existing public dataset in hopes that the findings from that dataset might reveal insights which will assist in Bellabeat's marketing strategies for future growth. My task is to provide data driven insights to business tasks provided by the Bellabeats, Inc.'s executive and data analysis team. In order to accomplish this task, I will complete all parts of the Data Analysis Process (Ask, Prepare, Process, Analyze, Share, Act). In addition, I will break each part of the Data Analysis Process down into three sections to provide clarity and accountability. Those three sections are: Guiding Questions, Key Tasks, and Deliverables. For the sake of space and to avoid repetition, I will record the deliverables for each Key Task directly under the numbered Key Task using an asterisk (*) as an identifier.
Section 1 - Ask:
A. Guiding Questions:
1. Who are the key stakeholders and what are their goals for the data analysis project?
2. What is the business task that this data analysis project is attempting to solve?
B. Key Tasks: 1. Identify key stakeholders and their goals for the data analysis project *The key stakeholders for this project are as follows: -Urška Sršen and Sando Mur - co-founders of Bellabeats, Inc. -Bellabeats marketing analytics team. I am a member of this team.
Section 2 - Prepare:
A. Guiding Questions: 1. Where is the data stored and organized? 2. Are there any problems with the data? 3. How does the data help answer the business question?
B. Key Tasks:
Research and communicate the source of the data, and how it is stored/organized to stakeholders.
*The data source used for our case study is FitBit Fitness Tracker Data. This dataset is stored in Kaggle and was made available through user Mobius in an open-source format. Therefore, the data is public and available to be copied, modified, and distributed, all without asking the user for permission. These datasets were generated by respondents to a distributed survey via Amazon Mechanical Turk reportedly (see credibility section directly below) between 03/12/2016 thru 05/12/2016.
*Reportedly (see credibility section directly below), thirty eligible Fitbit users consented to the submission of personal tracker data, including output related to steps taken, calories burned, time spent sleeping, heart rate, and distance traveled. This data was broken down into minute, hour, and day level totals. This data is stored in 18 CSV documents. I downloaded all 18 documents into my local laptop and decided to use 2 documents for the purposes of this project as they were files which had merged activity and sleep data from the other documents. All unused documents were permanently deleted from the laptop. The 2 files used were:
-sleepDay_merged.csv
-dailyActivity_merged.csv
Identify and communicate to stakeholders any problems found with the data related to credibility and bias. *As will be more specifically presented in the Process section, the data seems to have credibility issues related to the reported time frame of the data collected. The metadata seems to indicate that the data collected covered roughly 2 months of FitBit tracking. However, upon my initial data processing, I found that only 1 month of data was reported. *As will be more specifically presented in the Process section, the data has credibility issues related to the number of individuals who reported FitBit data. Specifically, the metadata communicates that 30 individual users agreed to report their tracking data. My initial data processing uncovered 33 individual ...
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TwitterA data cleaning tool customised for cleaning and sorting the data generated during the Enviro-Champs pilot study as they are downloaded from Formshare, the platform capturing data sent from a customised ODK Collect form collection app. The dataset inclues the latest data from the pilot study as at 14 May 2024.
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According to our latest research, the global Autonomous Data Cleaning with AI market size in 2024 reached USD 1.82 billion, reflecting a robust expansion driven by rapid digital transformation across industries. The market is experiencing a CAGR of 25.7% from 2025 to 2033, with forecasts indicating that the market will reach USD 14.4 billion by 2033. This remarkable growth is primarily attributed to the increasing demand for high-quality, reliable data to power advanced analytics and artificial intelligence initiatives, as well as the escalating complexity and volume of data in modern enterprises.
The surge in the adoption of artificial intelligence and machine learning technologies is a critical growth factor propelling the Autonomous Data Cleaning with AI market. Organizations are increasingly recognizing the importance of clean, accurate data as a foundational asset for digital transformation, predictive analytics, and data-driven decision-making. As data volumes continue to explode, manual data cleaning processes have become unsustainable, leading enterprises to seek autonomous solutions powered by AI algorithms. These solutions not only automate error detection and correction but also enhance data consistency, integrity, and usability across disparate systems, reducing operational costs and improving business agility.
Another significant driver for the Autonomous Data Cleaning with AI market is the rising regulatory pressure around data governance and compliance. Industries such as banking, finance, and healthcare are subject to stringent data quality requirements, necessitating robust mechanisms to ensure data accuracy and traceability. AI-powered autonomous data cleaning tools are increasingly being integrated into enterprise data management strategies to address these regulatory challenges. These tools help organizations maintain compliance, minimize the risk of data breaches, and avoid costly penalties, further fueling market growth as regulatory frameworks become more complex and widespread across global markets.
The proliferation of cloud computing and the shift towards hybrid and multi-cloud environments are also accelerating the adoption of Autonomous Data Cleaning with AI solutions. As organizations migrate workloads and data assets to the cloud, ensuring data quality across distributed environments becomes paramount. Cloud-based autonomous data cleaning platforms offer scalability, flexibility, and integration capabilities that are well-suited to dynamic enterprise needs. The growing ecosystem of cloud-native AI tools, combined with the increasing sophistication of data integration and orchestration platforms, is enabling businesses to deploy autonomous data cleaning at scale, driving substantial market expansion.
From a regional perspective, North America continues to dominate the Autonomous Data Cleaning with AI market, accounting for the largest revenue share in 2024. The region’s advanced technological infrastructure, high concentration of AI innovators, and early adoption by large enterprises are key factors supporting its leadership position. However, Asia Pacific is emerging as the fastest-growing regional market, fueled by rapid digitalization, expanding IT investments, and strong government initiatives supporting AI and data-driven innovation. Europe also remains a significant contributor, with increasing adoption in sectors such as banking, healthcare, and manufacturing. Overall, the global market exhibits a broadening geographic footprint, with opportunities emerging across both developed and developing economies.
The Autonomous Data Cleaning with AI market is segmented by component into Software and Services. The software segment currently holds the largest share of the market, driven by the rapid advancement and deployment of AI-powered data cleaning platforms. These software solutions leverage sophisticated algorithms for anomaly detection, deduplication, data enrichment, and validation, providing organizations with automated tools to ensure data quality at scale. The increasing integration of machine learning and natural language processing (NLP) capabilities further enhances the effectiveness of these platforms, enabling them to address a wide range of data quality issues across structured and unstructured datasets.
The
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Our privacy-first mobile location data unveils hidden patterns and opportunities, provides actionable insights, and fuels data-driven decision-making at the world's biggest companies.
These companies rely on our privacy-first Mobile Location and Points-of-Interest Data to unveil hidden patterns and opportunities, provide actionable insights, and fuel data-driven decision-making. They build better AI models, uncover business insights, and enable location-based services using our robust and reliable real-world data.
We conduct stringent evaluations on data providers to ensure authenticity and quality. Our proprietary algorithms detect, and cleanse corrupted and duplicated data points – allowing you to leverage our datasets rapidly with minimal processing or cleaning. During the ingestion process, our proprietary Data Filtering Algorithms remove events based on a number of both qualitative factors, as well as latency and other integrity variables to provide more efficient data delivery. The deduplicating algorithm focuses on a combination of four important attributes: Device ID, Latitude, Longitude, and Timestamp. This algorithm scours our data and identifies rows that contain the same combination of these four attributes. Post-identification, it retains a single copy and eliminates duplicate values to ensure our customers only receive complete and unique datasets.
We actively identify overlapping values at the provider level to determine the value each offers. Our data science team has developed a sophisticated overlap analysis model that helps us maintain a high-quality data feed by qualifying providers based on unique data values rather than volumes alone – measures that provide significant benefit to our end-use partners.
Quadrant mobility data contains all standard attributes such as Device ID, Latitude, Longitude, Timestamp, Horizontal Accuracy, and IP Address, and non-standard attributes such as Geohash and H3. In addition, we have historical data available back through 2022.
Through our in-house data science team, we offer sophisticated technical documentation, location data algorithms, and queries that help data buyers get a head start on their analyses. Our goal is to provide you with data that is “fit for purpose”.
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Data Science Platform Market Size 2025-2029
The data science platform market size is valued to increase USD 763.9 million, at a CAGR of 40.2% from 2024 to 2029. Integration of AI and ML technologies with data science platforms will drive the data science platform market.
Major Market Trends & Insights
North America dominated the market and accounted for a 48% growth during the forecast period.
By Deployment - On-premises segment was valued at USD 38.70 million in 2023
By Component - Platform segment accounted for the largest market revenue share in 2023
Market Size & Forecast
Market Opportunities: USD 1.00 million
Market Future Opportunities: USD 763.90 million
CAGR : 40.2%
North America: Largest market in 2023
Market Summary
The market represents a dynamic and continually evolving landscape, underpinned by advancements in core technologies and applications. Key technologies, such as machine learning and artificial intelligence, are increasingly integrated into data science platforms to enhance predictive analytics and automate data processing. Additionally, the emergence of containerization and microservices in data science platforms enables greater flexibility and scalability. However, the market also faces challenges, including data privacy and security risks, which necessitate robust compliance with regulations.
According to recent estimates, the market is expected to account for over 30% of the overall big data analytics market by 2025, underscoring its growing importance in the data-driven business landscape.
What will be the Size of the Data Science Platform Market during the forecast period?
Get Key Insights on Market Forecast (PDF) Request Free Sample
How is the Data Science Platform Market Segmented and what are the key trends of market segmentation?
The data science platform industry research report provides comprehensive data (region-wise segment analysis), with forecasts and estimates in 'USD million' for the period 2025-2029, as well as historical data from 2019-2023 for the following segments.
Deployment
On-premises
Cloud
Component
Platform
Services
End-user
BFSI
Retail and e-commerce
Manufacturing
Media and entertainment
Others
Sector
Large enterprises
SMEs
Application
Data Preparation
Data Visualization
Machine Learning
Predictive Analytics
Data Governance
Others
Geography
North America
US
Canada
Europe
France
Germany
UK
Middle East and Africa
UAE
APAC
China
India
Japan
South America
Brazil
Rest of World (ROW)
By Deployment Insights
The on-premises segment is estimated to witness significant growth during the forecast period.
In the dynamic and evolving the market, big data processing is a key focus, enabling advanced model accuracy metrics through various data mining methods. Distributed computing and algorithm optimization are integral components, ensuring efficient handling of large datasets. Data governance policies are crucial for managing data security protocols and ensuring data lineage tracking. Software development kits, model versioning, and anomaly detection systems facilitate seamless development, deployment, and monitoring of predictive modeling techniques, including machine learning algorithms, regression analysis, and statistical modeling. Real-time data streaming and parallelized algorithms enable real-time insights, while predictive modeling techniques and machine learning algorithms drive business intelligence and decision-making.
Cloud computing infrastructure, data visualization tools, high-performance computing, and database management systems support scalable data solutions and efficient data warehousing. ETL processes and data integration pipelines ensure data quality assessment and feature engineering techniques. Clustering techniques and natural language processing are essential for advanced data analysis. The market is witnessing significant growth, with adoption increasing by 18.7% in the past year, and industry experts anticipate a further expansion of 21.6% in the upcoming period. Companies across various sectors are recognizing the potential of data science platforms, leading to a surge in demand for scalable, secure, and efficient solutions.
API integration services and deep learning frameworks are gaining traction, offering advanced capabilities and seamless integration with existing systems. Data security protocols and model explainability methods are becoming increasingly important, ensuring transparency and trust in data-driven decision-making. The market is expected to continue unfolding, with ongoing advancements in technology and evolving business needs shaping its future trajectory.
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The On-premises segment was valued at USD 38.70 million in 2019 and showed
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Alinaghi, N., Giannopoulos, I., Kattenbeck, M., & Raubal, M. (2025). Decoding wayfinding: analyzing wayfinding processes in the outdoor environment. International Journal of Geographical Information Science, 1–31. https://doi.org/10.1080/13658816.2025.2473599
Link to the paper: https://www.tandfonline.com/doi/full/10.1080/13658816.2025.2473599
The folder named “submission” contains the following:
ijgis.yml: This file lists all the Python libraries and dependencies required to run the code.ijgis.yml file to create a Python project and environment. Ensure you activate the environment before running the code.pythonProject folder contains several .py files and subfolders, each with specific functionality as described below..png file for each column of the raw gaze and IMU recordings, color-coded with logged events..csv files.overlapping_sliding_window_loop.py.plot_labels_comparison(df, save_path, x_label_freq=10, figsize=(15, 5)) in line 116 visualizes the data preparation results. As this visualization is not used in the paper, the line is commented out, but if you want to see visually what has been changed compared to the original data, you can comment out this line..csv files in the results folder.This part contains three main code blocks:
iii. One for the XGboost code with correct hyperparameter tuning:
Please read the instructions for each block carefully to ensure that the code works smoothly. Regardless of which block you use, you will get the classification results (in the form of scores) for unseen data. The way we empirically test the confidence threshold of
Note: Please read the instructions for each block carefully to ensure that the code works smoothly. Regardless of which block you use, you will get the classification results (in the form of scores) for unseen data. The way we empirically calculated the confidence threshold of the model (explained in the paper in Section 5.2. Part II: Decoding surveillance by sequence analysis) is given in this block in lines 361 to 380.
.csv file containing inferred labels.The data is licensed under CC-BY, the code is licensed under MIT.
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Case study: How does a bike-share navigate speedy success?
Scenario:
As a data analyst on Cyclistic's marketing team, our focus is on enhancing annual memberships to drive the company's success. We aim to analyze the differing usage patterns between casual riders and annual members to craft a marketing strategy aimed at converting casual riders. Our recommendations, supported by data insights and professional visualizations, await Cyclistic executives' approval to proceed.
About the company
In 2016, Cyclistic launched a bike-share program in Chicago, growing to 5,824 bikes and 692 stations. Initially, their marketing aimed at broad segments with flexible pricing plans attracting both casual riders (single-ride or full-day passes) and annual members. However, recognizing that annual members are more profitable, Cyclistic is shifting focus to convert casual riders into annual members. To achieve this, they plan to analyze historical bike trip data to understand the differences and preferences between the two user groups, aiming to tailor marketing strategies that encourage casual riders to purchase annual memberships.
Project Overview:
This capstone project is a culmination of the skills and knowledge acquired through the Google Professional Data Analytics Certification. It focuses on Track 1, which is centered around Cyclistic, a fictional bike-share company modeled to reflect real-world data analytics scenarios in the transportation and service industry.
Dataset Acknowledgment:
We are grateful to Motivate Inc. for providing the dataset that serves as the foundation of this capstone project. Their contribution has enabled us to apply practical data analytics techniques to a real-world dataset, mirroring the challenges and opportunities present in the bike-sharing sector.
Objective:
The primary goal of this project is to analyze the Cyclistic dataset to uncover actionable insights that could help the company optimize its operations, improve customer satisfaction, and increase its market share. Through comprehensive data exploration, cleaning, analysis, and visualization, we aim to identify patterns and trends that inform strategic business decisions.
Methodology:
Data Collection: Utilizing the dataset provided by Motivate Inc., which includes detailed information on bike usage, customer behavior, and operational metrics. Data Cleaning and Preparation: Ensuring the dataset is accurate, complete, and ready for analysis by addressing any inconsistencies, missing values, or anomalies. Data Analysis: Applying statistical methods and data analytics techniques to extract meaningful insights from the dataset.
Visualization and Reporting:
Creating intuitive and compelling visualizations to present the findings clearly and effectively, facilitating data-driven decision-making. Findings and Recommendations:
Conclusion:
The Cyclistic Capstone Project not only demonstrates the practical application of data analytics skills in a real-world scenario but also provides valuable insights that can drive strategic improvements for Cyclistic. Through this project, showcasing the power of data analytics in transforming data into actionable knowledge, underscoring the importance of data-driven decision-making in today's competitive business landscape.
Acknowledgments:
Special thanks to Motivate Inc. for their support and for providing the dataset that made this project possible. Their contribution is immensely appreciated and has significantly enhanced the learning experience.
STRATEGIES USED
Case Study Roadmap - ASK
●What is the problem you are trying to solve? ●How can your insights drive business decisions?
Key Tasks ● Identify the business task ● Consider key stakeholders
Deliverable ● A clear statement of the business task
Case Study Roadmap - PREPARE
● Where is your data located? ● Are there any problems with the data?
Key tasks ● Download data and store it appropriately. ● Identify how it’s organized.
Deliverable ● A description of all data sources used
Case Study Roadmap - PROCESS
● What tools are you choosing and why? ● What steps have you taken to ensure that your data is clean?
Key tasks ● Choose your tools. ● Document the cleaning process.
Deliverable ● Documentation of any cleaning or manipulation of data
Case Study Roadmap - ANALYZE
● Has your data been properly formaed? ● How will these insights help answer your business questions?
Key tasks ● Perform calculations ● Formatting
Deliverable ● A summary of analysis
Case Study Roadmap - SHARE
● Were you able to answer all questions of stakeholders? ● Can Data visualization help you share findings?
Key tasks ● Present your findings ● Create effective data viz.
Deliverable ● Supporting viz and key findings
**Case Study Roadmap - A...
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According to our latest research, the global Yield Data Cleaning Software market size in 2024 stands at USD 1.14 billion, with a robust compound annual growth rate (CAGR) of 13.2% expected from 2025 to 2033. By the end of 2033, the market is forecasted to reach USD 3.42 billion. This remarkable market expansion is being driven by the increasing adoption of precision agriculture technologies, the proliferation of big data analytics in farming, and the rising need for accurate, real-time agricultural data to optimize yields and resource efficiency.
One of the primary growth factors fueling the Yield Data Cleaning Software market is the rapid digital transformation within the agriculture sector. The integration of advanced sensors, IoT devices, and GPS-enabled machinery has led to an exponential increase in the volume of raw agricultural data generated on farms. However, this data often contains inconsistencies, errors, and redundancies due to equipment malfunctions, environmental factors, and human error. Yield Data Cleaning Software plays a critical role by automating the cleansing, validation, and normalization of such datasets, ensuring that only high-quality, actionable information is used for decision-making. As a result, farmers and agribusinesses can make more informed choices, leading to improved crop yields, efficient resource allocation, and reduced operational costs.
Another significant driver is the growing emphasis on sustainable agriculture and environmental stewardship. Governments and regulatory bodies across the globe are increasingly mandating the adoption of data-driven practices to minimize the environmental impact of farming activities. Yield Data Cleaning Software enables stakeholders to monitor and analyze field performance accurately, track input usage, and comply with sustainability standards. Moreover, the software’s ability to integrate seamlessly with farm management platforms and analytics tools enhances its value proposition. This trend is further bolstered by the rising demand for traceability and transparency in the food supply chain, compelling agribusinesses to invest in robust data management solutions.
The market is also witnessing substantial investments from technology providers, venture capitalists, and agricultural equipment manufacturers. Strategic partnerships and collaborations are becoming commonplace, with companies seeking to enhance their product offerings and expand their geographical footprint. The increasing awareness among farmers about the benefits of data accuracy and the availability of user-friendly, customizable software solutions are further accelerating market growth. Additionally, ongoing advancements in artificial intelligence (AI) and machine learning (ML) are enabling more sophisticated data cleaning algorithms, which can handle larger datasets and deliver deeper insights, thereby expanding the market’s potential applications.
Regionally, North America continues to dominate the Yield Data Cleaning Software market, supported by its advanced agricultural infrastructure, high rate of technology adoption, and significant investments in agri-tech startups. Europe follows closely, driven by stringent environmental regulations and a strong focus on sustainable farming practices. The Asia Pacific region is emerging as a high-growth market, fueled by the rapid modernization of agriculture, government initiatives to boost food security, and increasing awareness among farmers about the benefits of digital solutions. Latin America and the Middle East & Africa are also showing promising growth trajectories, albeit from a smaller base, as they gradually embrace precision agriculture technologies.
The Yield Data Cleaning Software market is bifurcated by component into Software and Services. The software segment currently accounts for the largest share of the market, underpinned by the increasing adoption of integrated farm management solutions and the demand for user-friendly platforms that can seamlessly process vast amounts of agricultural data. Modern yield data cleaning software solutions are equipped with advanced algorithms capable of detecting and rectifying data anomalies, thus ensuring the integrity and reliability of yield datasets. As the complexity of agricultural operations grows, the need for scalable, customizable software that can adapt to
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Project Overview : This project demonstrates a thorough data cleaning process for the Nashville Housing dataset using SQL. The script performs various data cleaning and transformation operations to improve the quality and usability of the data for further analysis.
Technologies Used : SQL Server T-SQL
Dataset: The project uses the Nashville Housing dataset, which contains information about property sales in Nashville, Tennessee. The original dataset includes various fields such as property addresses, sale dates, sale prices, and other relevant real estate information. Data Cleaning Operations The script performs the following data cleaning operations:
Date Standardization: Converts the SaleDate column to a standard Date format for consistency and easier manipulation. Populating Missing Property Addresses: Fills in NULL values in the PropertyAddress field using data from other records with the same ParcelID. Breaking Down Address Components: Separates the PropertyAddress and OwnerAddress fields into individual columns for Address, City, and State, improving data granularity and queryability. Standardizing Values: Converts 'Y' and 'N' values to 'Yes' and 'No' in the SoldAsVacant field for clarity and consistency. Removing Duplicates: Identifies and removes duplicate records based on specific criteria to ensure data integrity. Dropping Unused Columns: Removes unnecessary columns to streamline the dataset.
Key SQL Techniques Demonstrated :
Data type conversion Self joins for data population String manipulation (SUBSTRING, CHARINDEX, PARSENAME) CASE statements Window functions (ROW_NUMBER) Common Table Expressions (CTEs) Data deletion Table alterations (adding and dropping columns)
Important Notes :
The script includes cautionary comments about data deletion and column dropping, emphasizing the importance of careful consideration in a production environment. This project showcases various SQL data cleaning techniques and can serve as a template for similar data cleaning tasks.
Potential Improvements :
Implement error handling and transaction management for more robust execution. Add data validation steps to ensure the cleaned data meets specific criteria. Consider creating indexes on frequently queried columns for performance optimization.
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Reddit is a social news, content rating and discussion website. It's one of the most popular sites on the internet. Reddit has 52 million daily active users and approximately 430 million users who use it once a month. Reddit has different subreddits and here We'll use the r/AskScience Subreddit.
The dataset is extracted from the subreddit /r/AskScience from Reddit. The data was collected between 01-01-2016 and 20-05-2022. It contains 612,668 Datapoints and 25 Columns. The database contains a number of information about the questions asked on the subreddit, the description of the submission, the flair of the question, NSFW or SFW status, the year of the submission, and more. The data is extracted using python and Pushshift's API. A little bit of cleaning is done using NumPy and pandas as well. (see the descriptions of individual columns below).
The dataset contains the following columns and descriptions: author - Redditor Name author_fullname - Redditor Full name contest_mode - Contest mode [implement obscured scores and randomized sorting]. created_utc - Time the submission was created, represented in Unix Time. domain - Domain of submission. edited - If the post is edited or not. full_link - Link of the post on the subreddit. id - ID of the submission. is_self - Whether or not the submission is a self post (text-only). link_flair_css_class - CSS Class used to identify the flair. link_flair_text - Flair on the post or The link flair’s text content. locked - Whether or not the submission has been locked. num_comments - The number of comments on the submission. over_18 - Whether or not the submission has been marked as NSFW. permalink - A permalink for the submission. retrieved_on - time ingested. score - The number of upvotes for the submission. description - Description of the Submission. spoiler - Whether or not the submission has been marked as a spoiler. stickied - Whether or not the submission is stickied. thumbnail - Thumbnail of Submission. question - Question Asked in the Submission. url - The URL the submission links to, or the permalink if a self post. year - Year of the Submission. banned - Banned by the moderator or not.
This dataset can be used for Flair Prediction, NSFW Classification, and different Text Mining/NLP tasks. Exploratory Data Analysis can also be done to get the insights and see the trend and patterns over the years.
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According to our latest research, the global Data Cleansing for Warehouse Master Data market size was valued at USD 2.14 billion in 2024, with a robust growth trajectory projected through the next decade. The market is expected to reach USD 6.12 billion by 2033, expanding at a Compound Annual Growth Rate (CAGR) of 12.4% from 2025 to 2033. This significant growth is primarily driven by the escalating need for high-quality, accurate, and reliable data in warehouse operations, which is crucial for operational efficiency, regulatory compliance, and strategic decision-making in an increasingly digitalized supply chain ecosystem.
One of the primary growth factors for the Data Cleansing for Warehouse Master Data market is the exponential rise in data volumes generated by modern warehouse management systems, IoT devices, and automated logistics solutions. With the proliferation of e-commerce, omnichannel retail, and globalized supply chains, warehouses are now processing vast amounts of transactional and inventory data daily. Inaccurate or duplicate master data can lead to costly errors, inefficiencies, and compliance risks. As a result, organizations are investing heavily in advanced data cleansing solutions to ensure that their warehouse master data is accurate, consistent, and up to date. This trend is further amplified by the adoption of artificial intelligence and machine learning algorithms that automate the identification and rectification of data anomalies, thereby reducing manual intervention and enhancing data integrity.
Another critical driver is the increasing regulatory scrutiny surrounding data governance and compliance, especially in sectors such as healthcare, food and beverage, and pharmaceuticals, where traceability and data accuracy are paramount. The introduction of stringent regulations such as the General Data Protection Regulation (GDPR) in Europe, the Health Insurance Portability and Accountability Act (HIPAA) in the United States, and similar frameworks worldwide, has compelled organizations to prioritize data quality initiatives. Data cleansing tools for warehouse master data not only help organizations meet these regulatory requirements but also provide a competitive advantage by enabling more accurate forecasting, inventory optimization, and risk management. Furthermore, as organizations expand their digital transformation initiatives, the integration of disparate data sources and legacy systems underscores the importance of robust data cleansing processes.
The growing adoption of cloud-based data management solutions is also shaping the landscape of the Data Cleansing for Warehouse Master Data market. Cloud deployment offers scalability, flexibility, and cost-efficiency, making it an attractive option for both large enterprises and small and medium-sized businesses (SMEs). Cloud-based data cleansing platforms facilitate real-time data synchronization across multiple warehouse locations and business units, ensuring that master data remains consistent and actionable. This trend is expected to gain further momentum as more organizations embrace hybrid and multi-cloud strategies to support their global operations. The combination of cloud computing and advanced analytics is enabling organizations to derive deeper insights from their warehouse data, driving further investment in data cleansing technologies.
From a regional perspective, North America currently leads the market, accounting for the largest share in 2024, followed closely by Europe and Asia Pacific. The high adoption rate of advanced warehouse management systems, coupled with the presence of major technology providers and a mature regulatory environment, has propelled the growth of the market in these regions. Meanwhile, the Asia Pacific region is expected to witness the fastest growth during the forecast period, driven by rapid industrialization, expansion of e-commerce, and increasing investments in digital infrastructure. Latin America and the Middle East & Africa are also emerging as promising markets, supported by growing awareness of data quality issues and the need for efficient supply chain management. Overall, the global outlook for the Data Cleansing for Warehouse Master Data market remains highly positive, with strong demand anticipated across all major regions.
The Component segment of the Data Cleansing for Warehouse Master Data market i
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TwitterThe main objective of the HEIS survey is to obtain detailed data on household expenditure and income, linked to various demographic and socio-economic variables, to enable computation of poverty indices and determine the characteristics of the poor and prepare poverty maps. Therefore, to achieve these goals, the sample had to be representative on the sub-district level. The raw survey data provided by the Statistical Office was cleaned and harmonized by the Economic Research Forum, in the context of a major research project to develop and expand knowledge on equity and inequality in the Arab region. The main focus of the project is to measure the magnitude and direction of change in inequality and to understand the complex contributing social, political and economic forces influencing its levels. However, the measurement and analysis of the magnitude and direction of change in this inequality cannot be consistently carried out without harmonized and comparable micro-level data on income and expenditures. Therefore, one important component of this research project is securing and harmonizing household surveys from as many countries in the region as possible, adhering to international statistics on household living standards distribution. Once the dataset has been compiled, the Economic Research Forum makes it available, subject to confidentiality agreements, to all researchers and institutions concerned with data collection and issues of inequality.
Data collected through the survey helped in achieving the following objectives: 1. Provide data weights that reflect the relative importance of consumer expenditure items used in the preparation of the consumer price index 2. Study the consumer expenditure pattern prevailing in the society and the impact of demograohic and socio-economic variables on those patterns 3. Calculate the average annual income of the household and the individual, and assess the relationship between income and different economic and social factors, such as profession and educational level of the head of the household and other indicators 4. Study the distribution of individuals and households by income and expenditure categories and analyze the factors associated with it 5. Provide the necessary data for the national accounts related to overall consumption and income of the household sector 6. Provide the necessary income data to serve in calculating poverty indices and identifying the poor chracteristics as well as drawing poverty maps 7. Provide the data necessary for the formulation, follow-up and evaluation of economic and social development programs, including those addressed to eradicate poverty
National
The survey covered a national sample of households and all individuals permanently residing in surveyed households.
Sample survey data [ssd]
The 2008 Household Expenditure and Income Survey sample was designed using two-stage cluster stratified sampling method. In the first stage, the primary sampling units (PSUs), the blocks, were drawn using probability proportionate to the size, through considering the number of households in each block to be the block size. The second stage included drawing the household sample (8 households from each PSU) using the systematic sampling method. Fourth substitute households from each PSU were drawn, using the systematic sampling method, to be used on the first visit to the block in case that any of the main sample households was not visited for any reason.
To estimate the sample size, the coefficient of variation and design effect in each subdistrict were calculated for the expenditure variable from data of the 2006 Household Expenditure and Income Survey. This results was used to estimate the sample size at sub-district level, provided that the coefficient of variation of the expenditure variable at the sub-district level did not exceed 10%, with a minimum number of clusters that should not be less than 6 at the district level, that is to ensure good clusters representation in the administrative areas to enable drawing poverty pockets.
It is worth mentioning that the expected non-response in addition to areas where poor families are concentrated in the major cities were taken into consideration in designing the sample. Therefore, a larger sample size was taken from these areas compared to other ones, in order to help in reaching the poverty pockets and covering them.
Face-to-face [f2f]
List of survey questionnaires: (1) General Form (2) Expenditure on food commodities Form (3) Expenditure on non-food commodities Form
Raw Data The design and implementation of this survey procedures were: 1. Sample design and selection 2. Design of forms/questionnaires, guidelines to assist in filling out the questionnaires, and preparing instruction manuals 3. Design the tables template to be used for the dissemination of the survey results 4. Preparation of the fieldwork phase including printing forms/questionnaires, instruction manuals, data collection instructions, data checking instructions and codebooks 5. Selection and training of survey staff to collect data and run required data checkings 6. Preparation and implementation of the pretest phase for the survey designed to test and develop forms/questionnaires, instructions and software programs required for data processing and production of survey results 7. Data collection 8. Data checking and coding 9. Data entry 10. Data cleaning using data validation programs 11. Data accuracy and consistency checks 12. Data tabulation and preliminary results 13. Preparation of the final report and dissemination of final results
Harmonized Data - The Statistical Package for Social Science (SPSS) was used to clean and harmonize the datasets - The harmonization process started with cleaning all raw data files received from the Statistical Office - Cleaned data files were then all merged to produce one data file on the individual level containing all variables subject to harmonization - A country-specific program was generated for each dataset to generate/compute/recode/rename/format/label harmonized variables - A post-harmonization cleaning process was run on the data - Harmonized data was saved on the household as well as the individual level, in SPSS and converted to STATA format
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Data Wrangling Market Size 2024-2028
The data wrangling market size is forecast to increase by USD 1.4 billion at a CAGR of 14.8% between 2023 and 2028. The market is experiencing significant growth due to the numerous benefits provided by data wrangling solutions, including data cleaning, transformation, and enrichment. One major trend driving market growth is the rising need for technology such as the competitive intelligence and artificial intelligence in the healthcare sector, where data wrangling is essential for managing and analyzing patient data to improve patient outcomes and reduce costs. However, a challenge facing the market is the lack of awareness of data wrangling tools among small and medium-sized enterprises (SMEs), which limits their ability to effectively manage and utilize their data. Despite this, the market is expected to continue growing as more organizations recognize the value of data wrangling in driving business insights and decision-making.
What will be the Size of the Market During the Forecast Period?
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The market is experiencing significant growth due to the increasing demand for data management and analysis in various industries. The market is experiencing significant growth due to the increasing volume, variety, and velocity of data being generated from various sources such as IoT devices, financial services, and smart cities. Artificial intelligence and machine learning technologies are being increasingly used for data preparation, data cleaning, and data unification. Data wrangling, also known as data munging, is the process of cleaning, transforming, and enriching raw data to make it usable for analysis. This process is crucial for businesses aiming to gain valuable insights from their data and make informed decisions. Data analytics is a primary driver for the market, as organizations seek to extract meaningful insights from their data. Cloud solutions are increasingly popular for data wrangling due to their flexibility, scalability, and cost-effectiveness.
Furthermore, both on-premises and cloud-based solutions are being adopted by businesses to meet their specific data management requirements. Multi-cloud strategies are also gaining traction in the market, as organizations seek to leverage the benefits of multiple cloud providers. This approach allows businesses to distribute their data across multiple clouds, ensuring business continuity and disaster recovery capabilities. Data quality is another critical factor driving the market. Ensuring data accuracy, completeness, and consistency is essential for businesses to make reliable decisions. The market is expected to grow further as organizations continue to invest in big data initiatives and implement advanced technologies such as AI and ML to gain a competitive edge. Data cleaning and data unification are key processes in data wrangling that help improve data quality. The finance and insurance industries are major contributors to the market, as they generate vast amounts of data daily.
In addition, real-time analysis is becoming increasingly important in these industries, as businesses seek to gain insights from their data in near real-time to make informed decisions. The Internet of Things (IoT) is also driving the market, as businesses seek to collect and analyze data from IoT devices to gain insights into their operations and customer behavior. Edge computing is becoming increasingly popular for processing IoT data, as it allows for faster analysis and decision-making. Self-service data preparation is another trend in the market, as businesses seek to empower their business users to prepare their data for analysis without relying on IT departments.
Moreover, this approach allows businesses to be more agile and responsive to changing business requirements. Big data is another significant trend in the market, as businesses seek to manage and analyze large volumes of data to gain insights into their operations and customer behavior. Data wrangling is a critical process in managing big data, as it ensures that the data is clean, transformed, and enriched to make it usable for analysis. In conclusion, the market in North America is experiencing significant growth due to the increasing demand for data management and analysis in various industries. Cloud solutions, multi-cloud strategies, data quality, finance and insurance, IoT, real-time analysis, self-service data preparation, and big data are some of the key trends driving the market. Businesses that invest in data wrangling solutions can gain a competitive edge by gaining valuable insights from their data and making informed decisions.
Market Segmentation
The market research report provides comprehensive data (region-wise segment analysis), with forecasts and estimates in 'USD billion' for the period 2024-2028, as well as historical data from 2018-2022 for the following segments.
Sector
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| BASE YEAR | 2024 |
| HISTORICAL DATA | 2019 - 2023 |
| REGIONS COVERED | North America, Europe, APAC, South America, MEA |
| REPORT COVERAGE | Revenue Forecast, Competitive Landscape, Growth Factors, and Trends |
| MARKET SIZE 2024 | 2.4(USD Billion) |
| MARKET SIZE 2025 | 2.64(USD Billion) |
| MARKET SIZE 2035 | 6.8(USD Billion) |
| SEGMENTS COVERED | Type, Application, Deployment Model, End User, Regional |
| COUNTRIES COVERED | US, Canada, Germany, UK, France, Russia, Italy, Spain, Rest of Europe, China, India, Japan, South Korea, Malaysia, Thailand, Indonesia, Rest of APAC, Brazil, Mexico, Argentina, Rest of South America, GCC, South Africa, Rest of MEA |
| KEY MARKET DYNAMICS | increasing data volume, stringent data regulations, growing cloud adoption, rising demand for analytics, automated data processing |
| MARKET FORECAST UNITS | USD Billion |
| KEY COMPANIES PROFILED | Talend, Informatica, Data Ladder, Melissa Data, Micro Focus, WinPure, Oracle, SAP, SAS Institute, Experian, Stitch, Pitney Bowes, TIBCO Software, Trifacta, Dataloader.io, IBM |
| MARKET FORECAST PERIOD | 2025 - 2035 |
| KEY MARKET OPPORTUNITIES | Emerging AI-driven solutions, Integration with big data platforms, Increased demand for data compliance, Growing adoption in SMEs, Real-time data processing capabilities |
| COMPOUND ANNUAL GROWTH RATE (CAGR) | 9.9% (2025 - 2035) |
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Netflix is a popular streaming service that offers a vast catalog of movies, TV shows, and original contents. This dataset is a cleaned version of the original version which can be found here. The data consist of contents added to Netflix from 2008 to 2021. The oldest content is as old as 1925 and the newest as 2021. This dataset will be cleaned with PostgreSQL and visualized with Tableau. The purpose of this dataset is to test my data cleaning and visualization skills. The cleaned data can be found below and the Tableau dashboard can be found here .
We are going to: 1. Treat the Nulls 2. Treat the duplicates 3. Populate missing rows 4. Drop unneeded columns 5. Split columns Extra steps and more explanation on the process will be explained through the code comments
--View dataset
SELECT *
FROM netflix;
--The show_id column is the unique id for the dataset, therefore we are going to check for duplicates
SELECT show_id, COUNT(*)
FROM netflix
GROUP BY show_id
ORDER BY show_id DESC;
--No duplicates
--Check null values across columns
SELECT COUNT(*) FILTER (WHERE show_id IS NULL) AS showid_nulls,
COUNT(*) FILTER (WHERE type IS NULL) AS type_nulls,
COUNT(*) FILTER (WHERE title IS NULL) AS title_nulls,
COUNT(*) FILTER (WHERE director IS NULL) AS director_nulls,
COUNT(*) FILTER (WHERE movie_cast IS NULL) AS movie_cast_nulls,
COUNT(*) FILTER (WHERE country IS NULL) AS country_nulls,
COUNT(*) FILTER (WHERE date_added IS NULL) AS date_addes_nulls,
COUNT(*) FILTER (WHERE release_year IS NULL) AS release_year_nulls,
COUNT(*) FILTER (WHERE rating IS NULL) AS rating_nulls,
COUNT(*) FILTER (WHERE duration IS NULL) AS duration_nulls,
COUNT(*) FILTER (WHERE listed_in IS NULL) AS listed_in_nulls,
COUNT(*) FILTER (WHERE description IS NULL) AS description_nulls
FROM netflix;
We can see that there are NULLS.
director_nulls = 2634
movie_cast_nulls = 825
country_nulls = 831
date_added_nulls = 10
rating_nulls = 4
duration_nulls = 3
The director column nulls is about 30% of the whole column, therefore I will not delete them. I will rather find another column to populate it. To populate the director column, we want to find out if there is relationship between movie_cast column and director column
-- Below, we find out if some directors are likely to work with particular cast
WITH cte AS
(
SELECT title, CONCAT(director, '---', movie_cast) AS director_cast
FROM netflix
)
SELECT director_cast, COUNT(*) AS count
FROM cte
GROUP BY director_cast
HAVING COUNT(*) > 1
ORDER BY COUNT(*) DESC;
With this, we can now populate NULL rows in directors
using their record with movie_cast
UPDATE netflix
SET director = 'Alastair Fothergill'
WHERE movie_cast = 'David Attenborough'
AND director IS NULL ;
--Repeat this step to populate the rest of the director nulls
--Populate the rest of the NULL in director as "Not Given"
UPDATE netflix
SET director = 'Not Given'
WHERE director IS NULL;
--When I was doing this, I found a less complex and faster way to populate a column which I will use next
Just like the director column, I will not delete the nulls in country. Since the country column is related to director and movie, we are going to populate the country column with the director column
--Populate the country using the director column
SELECT COALESCE(nt.country,nt2.country)
FROM netflix AS nt
JOIN netflix AS nt2
ON nt.director = nt2.director
AND nt.show_id <> nt2.show_id
WHERE nt.country IS NULL;
UPDATE netflix
SET country = nt2.country
FROM netflix AS nt2
WHERE netflix.director = nt2.director and netflix.show_id <> nt2.show_id
AND netflix.country IS NULL;
--To confirm if there are still directors linked to country that refuse to update
SELECT director, country, date_added
FROM netflix
WHERE country IS NULL;
--Populate the rest of the NULL in director as "Not Given"
UPDATE netflix
SET country = 'Not Given'
WHERE country IS NULL;
The date_added rows nulls is just 10 out of over 8000 rows, deleting them cannot affect our analysis or visualization
--Show date_added nulls
SELECT show_id, date_added
FROM netflix_clean
WHERE date_added IS NULL;
--DELETE nulls
DELETE F...