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Sample data for exercises in Further Adventures in Data Cleaning.
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TwitterThis dataset is a cleaned and preprocessed version of the original Netflix Movies and TV Shows dataset available on Kaggle. All cleaning was done using Microsoft Excel — no programming involved.
🎯 What’s Included: - Cleaned Excel file (standardized columns, proper date format, removed duplicates/missing values) - A separate "formulas_used.txt" file listing all Excel formulas used during cleaning (e.g., TRIM, CLEAN, DATE, SUBSTITUTE, TEXTJOIN, etc.) - Columns like 'date_added' have been properly formatted into DMY structure - Multi-valued columns like 'listed_in' are split for better analysis - Null values replaced with “Unknown” for clarity - Duration field broken into numeric + unit components
🔍 Dataset Purpose: Ideal for beginners and analysts who want to: - Practice data cleaning in Excel - Explore Netflix content trends - Analyze content by type, country, genre, or date added
📁 Original Dataset Credit: The base version was originally published by Shivam Bansal on Kaggle: https://www.kaggle.com/shivamb/netflix-shows
📌 Bonus: You can find a step-by-step cleaning guide and the same dataset on GitHub as well — along with screenshots and formulas documentation.
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TwitterThis dataset was created by Shiva Vashishtha
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**Introduction ** This case study will be based on Cyclistic, a bike sharing company in Chicago. I will perform tasks of a junior data analyst to answer business questions. I will do this by following a process that includes the following phases: ask, prepare, process, analyze, share and act.
Background Cyclistic is a bike sharing company that operates 5828 bikes within 692 docking stations. The company has been around since 2016 and separates itself from the competition due to the fact that they offer a variety of bike services including assistive options. Lily Moreno is the director of the marketing team and will be the person to receive these insights from this analysis.
Case Study and business task Lily Morenos perspective on how to generate more income by marketing Cyclistics services correctly includes converting casual riders (one day passes and/or pay per ride customers) into annual riders with a membership. Annual riders are more profitable than casual riders according to the finance analysts. She would rather see a campaign targeting casual riders into annual riders, instead of launching campaigns targeting new costumers. So her strategy as the manager of the marketing team is simply to maximize the amount of annual riders by converting casual riders.
In order to make a data driven decision, Moreno needs the following insights:
A better understanding of how casual riders and annual riders differ Why would a casual rider become an annual one How digital media can affect the marketing tactics Moreno has directed me to the first question - how do casual riders and annual riders differ?
Stakeholders Lily Moreno, manager of the marketing team Cyclistic Marketing team Executive team
Data sources and organization Data used in this report is made available and is licensed by Motivate International Inc. Personal data is hidden to protect personal information. Data used is from the past 12 months (03/2022 – 02/2023) of bike share dataset.
By merging all 12 monthly bike share data provided, an extensive amount of data with 5,785,180 rows were returned and included in this analysis.
Data security and limitations: Personal information is secured and hidden to prevent unlawful use. Original files are backed up in folders and subfolders.
Tools and documentation of cleaning process The tools used for data verification and data cleaning are Microsoft Excel. The original files made accessible by Motivate International Inc. are backed up in their original format and in separate files.
Microsoft Excel is used to generally look through the dataset and get a overview of the content. I performed simple checks of the data by filtering, sorting, formatting and standardizing the data to make it easily mergeable.. In Excel, I also changed data type to have the right format, removed unnecessary data if its incomplete or incorrect, created new columns to subtract and reformat existing columns and deleting empty cells. These tasks are easily done in spreadsheets and provides an initial cleaning process of the data.
Limitations Microsoft Excel has a limitation of 1,048,576 rows while the data of the 12 months combined are over 5,785,180 rows. When combining the 12 months of data into one table/sheet, Excel is no longer efficient and I switched over to R programming.
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Performed in-depth analysis of Myntra's e-commerce data using Excel to identify sales trends, customer behavior, and performance metrics. Leveraged advanced Excel functionalities, including pivot tables, charts, conditional formatting, and data cleaning techniques, to derive actionable insights and create visually compelling reports.
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TwitterWe describe a bibliometric network characterizing co-authorship collaborations in the entire Italian academic community. The network, consisting of 38,220 nodes and 507,050 edges, is built upon two distinct data sources: faculty information provided by the Italian Ministry of University and Research and publications available in Semantic Scholar. Both nodes and edges are associated with a large variety of semantic data, including gender, bibliometric indexes, authors' and publications' research fields, and temporal information. While linking data between the two original sources posed many challenges, the network has been carefully validated to assess its reliability and to understand its graph-theoretic characteristics. By resembling several features of social networks, our dataset can be profitably leveraged in experimental studies in the wide social network analytics domain as well as in more specific bibliometric contexts. , The proposed network is built starting from two distinct data sources:
the entire dataset dump from Semantic Scholar (with particular emphasis on the authors and papers datasets) the entire list of Italian faculty members as maintained by Cineca (under appointment by the Italian Ministry of University and Research).
By means of a custom name-identity recognition algorithm (details are available in the accompanying paper published in Scientific Data), the names of the authors in the Semantic Scholar dataset have been mapped against the names contained in the Cineca dataset and authors with no match (e.g., because of not being part of an Italian university) have been discarded. The remaining authors will compose the nodes of the network, which have been enriched with node-related (i.e., author-related) attributes. In order to build the network edges, we leveraged the papers dataset from Semantic Scholar: specifically, any two authors are said to be connected if there is at least one pap..., , # Data cleaning and enrichment through data integration: networking the Italian academia
https://doi.org/10.5061/dryad.wpzgmsbwj
Manuscript published in Scientific Data with DOI .
This repository contains two main data files:
edge_data_AGG.csv, the full network in comma-separated edge list format (this file contains mainly temporal co-authorship information);Coauthorship_Network_AGG.graphml, the full network in GraphML format. along with several supplementary data, listed below, useful only to build the network (i.e., for reproducibility only):
University-City-match.xlsx, an Excel file that maps the name of a university against the city where its respective headquarter is located;Areas-SS-CINECA-match.xlsx, an Excel file that maps the research areas in Cineca against the research areas in Semantic Scholar.The `Coauthorship_Networ...
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TwitterThis project includes a series of Excel files demonstrating key Excel functionalities, including:
You can download the original Excel file with all formatting here: https://www.kaggle.com/datasets/carinacruz/excel-project
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TwitterThis dataset was generated from a set of Excel spreadsheets from an Information and Communication Technology Services (ICTS) administrative database on student applications to the University of Cape Town (UCT). This database contains information on applications to UCT between the January 2006 and December 2014. In the original form received by DataFirst the data were ill suited to research purposes. This dataset represents an attempt at cleaning and organizing these data into a more tractable format. To ensure data confidentiality direct identifiers have been removed from the data and the data is only made available to accredited researchers through DataFirst's Secure Data Service.
The dataset was separated into the following data files:
Applications, individuals
Administrative records [adm]
Other [oth]
The data files were made available to DataFirst as a group of Excel spreadsheet documents from an SQL database managed by the University of Cape Town's Information and Communication Technology Services . The process of combining these original data files to create a research-ready dataset is summarised in a document entitled "Notes on preparing the UCT Student Application Data 2006-2014" accompanying the data.
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The MTF survey is a global baseline survey on household access to electricity and clean cooking, which goes beyond the binary approach to look at access as a spectrum of service levels experienced by households. Resources included are raw data, codebook, questionnaires, sampling strategy document, and country diagnostic report. Formats include zip file (which includes raw data sets of dta format), excel spreadsheet, pdf, and docx.
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TwitterTool: Microsoft Excel
Dataset: Coffee Sales
Process: 1. Data Cleaning: • Remove duplicates and blanks. • Standardize date and currency formats.
Data Manipulation:
• Sorting and filtering function to work
with interest subsets of data.
• Use XLOOKUP, INDEX-MATCH and IF
formula for efficient data manipulation,
such as retrieving, matching and
organising information in spreadsheets
Data Analysis: • Create Pivot Tables and Pivot Charts with the formatting to visualize trends.
Dashboard Development: • Insert Slicers with the formatting for easy filtering and dynamic updates.
Highlights: This project aims to understand coffee sales trends by country, roast type, and year, which could help identify marketing opportunities and customer segments.
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This dataset contains a cleaned version of the Montgomery County Fleet Equipment Inventory.
✅ Data Cleaning Steps: - Removed duplicate records - Fixed spelling errors - Merged department names using Flash Fill - Removed unnecessary whitespace - Converted CSV to Excel (.XLSX) format
📂 Original Dataset Source: Montgomery County Public Dataset
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🛒 E-Commerce Data Analysis (Excel & Python Project) 📖 Overview
This project analyzes 10,000+ e-commerce sales records using Excel and Python (Pandas) to uncover valuable business insights. It covers essential data analysis techniques such as cleaning, aggregation, and visualization — perfect for beginners and data analyst learners.
🎯 Objectives
Understand customer purchasing trends
Identify top-selling products
Analyze monthly sales and revenue performance
Calculate business KPIs such as Total Revenue, Total Orders, and Average Order Value (AOV)
🧩 Dataset Information
File: ecommerce_simple_10k.csv Total Rows: 10,000 Columns:
Column Name Description order_id Unique order identifier product Product name quantity Number of items ordered price Price of a single item order_date Date of order placement city City where the order was placed 🧹 Data Cleaning (Python)
Key cleaning steps:
Removed currency symbols (₹) and commas from price and total_sales
Converted order_date into proper datetime format
Created new column month from order_date
Handled missing or incorrect data entries
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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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Google Ads Sales Dataset for Data Analytics Campaigns (Raw & Uncleaned) 📝 Dataset Overview This dataset contains raw, uncleaned advertising data from a simulated Google Ads campaign promoting data analytics courses and services. It closely mimics what real digital marketers and analysts would encounter when working with exported campaign data — including typos, formatting issues, missing values, and inconsistencies.
It is ideal for practicing:
Data cleaning
Exploratory Data Analysis (EDA)
Marketing analytics
Campaign performance insights
Dashboard creation using tools like Excel, Python, or Power BI
📁 Columns in the Dataset Column Name ----- -Description Ad_ID --------Unique ID of the ad campaign Campaign_Name ------Name of the campaign (with typos and variations) Clicks --Number of clicks received Impressions --Number of ad impressions Cost --Total cost of the ad (in ₹ or $ format with missing values) Leads ---Number of leads generated Conversions ----Number of actual conversions (signups, sales, etc.) Conversion Rate ---Calculated conversion rate (Conversions ÷ Clicks) Sale_Amount ---Revenue generated from the conversions Ad_Date------ Date of the ad activity (in inconsistent formats like YYYY/MM/DD, DD-MM-YY) Location ------------City where the ad was served (includes spelling/case variations) Device------------ Device type (Mobile, Desktop, Tablet with mixed casing) Keyword ----------Keyword that triggered the ad (with typos)
⚠️ Data Quality Issues (Intentional) This dataset was intentionally left raw and uncleaned to reflect real-world messiness, such as:
Inconsistent date formats
Spelling errors (e.g., "analitics", "anaytics")
Duplicate rows
Mixed units and symbols in cost/revenue columns
Missing values
Irregular casing in categorical fields (e.g., "mobile", "Mobile", "MOBILE")
🎯 Use Cases Data cleaning exercises in Python (Pandas), R, Excel
Data preprocessing for machine learning
Campaign performance analysis
Conversion optimization tracking
Building dashboards in Power BI, Tableau, or Looker
💡 Sample Analysis Ideas Track campaign cost vs. return (ROI)
Analyze click-through rates (CTR) by device or location
Clean and standardize campaign names and keywords
Investigate keyword performance vs. conversions
🔖 Tags Digital Marketing · Google Ads · Marketing Analytics · Data Cleaning · Pandas Practice · Business Analytics · CRM Data
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This dataset contains sales transaction records used to create an interactive Excel Sales Performance Dashboard for business analytics practice.
It includes six columns capturing essential sales metrics such as date, region, product, quantity, sales revenue, and profit. The data is structured to help analysts and learners explore data visualization, PivotTable summarization, and dashboard design concepts in Excel.
The dataset was created for educational and demonstration purposes to help users:
Columns: Date – Transaction date (daily sales record) Region – Geographic area of the sale (East, West, North, South) Product – Product category or item sold Sales – Total revenue generated from the sale (USD) Profit – Net profit made per transaction Quantity – Number of units sold
Typical uses include: Excel or Power BI dashboard projects PivotTable practice for business reporting Data cleaning and chart-building exercises Portfolio development for business analytics students Built and tested in Microsoft Excel using PivotTables, Charts, and Conditional Formatting.
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This dataset contains video game sales data prepared for an Excel data analysis and dashboard project.
It includes detailed information on:
Game titles
Platforms
Genres
Publishers
Regional and global sales
The dataset was cleaned, structured, and analyzed in Microsoft Excel to explore patterns in the global video game market. It can be used to:
Practice data cleaning and pivot tables
Build interactive dashboards
Perform sales comparisons across regions and genres
Develop business insights from entertainment data
🧩 File Information
Format: .xlsx (Excel Workbook)
Columns: Name, Platform, Year, Genre, Publisher, NA_Sales, EU_Sales, JP_Sales, Other_Sales, Global_Sales
💡 Use Cases
Excel dashboard and chart creation
Data visualization and storytelling
Business and market analysis practice
Portfolio or learning projects
👤 Prepared by
Adewale Lateef W — for data analysis and Excel dashboard learning purposes.
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The Dirty Retail Store Sales dataset contains 12,575 rows of synthetic data representing sales transactions from a retail store. The dataset includes eight product categories with 25 items per category, each having static prices. It is designed to simulate real-world sales data, including intentional "dirtiness" such as missing or inconsistent values. This dataset is suitable for practicing data cleaning, exploratory data analysis (EDA), and feature engineering.
retail_store_sales.csv| Column Name | Description | Example Values |
|---|---|---|
Transaction ID | A unique identifier for each transaction. Always present and unique. | TXN_1234567 |
Customer ID | A unique identifier for each customer. 25 unique customers. | CUST_01 |
Category | The category of the purchased item. | Food, Furniture |
Item | The name of the purchased item. May contain missing values or None. | Item_1_FOOD, None |
Price Per Unit | The static price of a single unit of the item. May contain missing or None values. | 4.00, None |
Quantity | The quantity of the item purchased. May contain missing or None values. | 1, None |
Total Spent | The total amount spent on the transaction. Calculated as Quantity * Price Per Unit. | 8.00, None |
Payment Method | The method of payment used. May contain missing or invalid values. | Cash, Credit Card |
Location | The location where the transaction occurred. May contain missing or invalid values. | In-store, Online |
Transaction Date | The date of the transaction. Always present and valid. | 2023-01-15 |
Discount Applied | Indicates if a discount was applied to the transaction. May contain missing values. | True, False, None |
The dataset includes the following categories, each containing 25 items with corresponding codes, names, and static prices:
| Item Code | Item Name | Price |
|---|---|---|
| Item_1_EHE | Blender | 5.0 |
| Item_2_EHE | Microwave | 6.5 |
| Item_3_EHE | Toaster | 8.0 |
| Item_4_EHE | Vacuum Cleaner | 9.5 |
| Item_5_EHE | Air Purifier | 11.0 |
| Item_6_EHE | Electric Kettle | 12.5 |
| Item_7_EHE | Rice Cooker | 14.0 |
| Item_8_EHE | Iron | 15.5 |
| Item_9_EHE | Ceiling Fan | 17.0 |
| Item_10_EHE | Table Fan | 18.5 |
| Item_11_EHE | Hair Dryer | 20.0 |
| Item_12_EHE | Heater | 21.5 |
| Item_13_EHE | Humidifier | 23.0 |
| Item_14_EHE | Dehumidifier | 24.5 |
| Item_15_EHE | Coffee Maker | 26.0 |
| Item_16_EHE | Portable AC | 27.5 |
| Item_17_EHE | Electric Stove | 29.0 |
| Item_18_EHE | Pressure Cooker | 30.5 |
| Item_19_EHE | Induction Cooktop | 32.0 |
| Item_20_EHE | Water Dispenser | 33.5 |
| Item_21_EHE | Hand Blender | 35.0 |
| Item_22_EHE | Mixer Grinder | 36.5 |
| Item_23_EHE | Sandwich Maker | 38.0 |
| Item_24_EHE | Air Fryer | 39.5 |
| Item_25_EHE | Juicer | 41.0 |
| Item Code | Item Name | Price |
|---|---|---|
| Item_1_FUR | Office Chair | 5.0 |
| Item_2_FUR | Sofa | 6.5 |
| Item_3_FUR | Coffee Table | 8.0 |
| Item_4_FUR | Dining Table | 9.5 |
| Item_5_FUR | Bookshelf | 11.0 |
| Item_6_FUR | Bed F... |
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The Superstore Sales Data dataset, available in an Excel format as "Superstore.xlsx," is a comprehensive collection of sales and customer-related information from a retail superstore. This dataset comprises* three distinct tables*, each providing specific insights into the store's operations and customer interactions.
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An exploratory data analysis project using Excel to understand what influences Instagram post reach and engagement.
مشروع تحليل استكشافي لفهم العوامل المؤثرة في وصول منشورات إنستغرام وتفاعل المستخدمين، باستخدام Excel.
This project uses an Instagram dataset imported from Kaggle to explore how different factors like hashtags, saves, shares, and caption length influence impressions and engagement.
يستخدم هذا المشروع بيانات من إنستغرام تم استيرادها من منصة Kaggle لتحليل كيف تؤثر عوامل مثل الهاشتاقات، الحفظ، المشاركة، وطول التسمية التوضيحية في عدد مرات الظهور والتفاعل.
TRIM Standardized formatting: freeze top row, wrap text, center align
إزالة المسافات غير الضرورية باستخدام TRIM
حذف 17 صفًا مكررًا → تبقى 103 صفوف فريدة
تنسيق موحد: تثبيت الصف الأول، لف النص، وتوسيط المحتوى
#Thecleverprogrammer, #Amankharwal, #Python Shorter captions and higher save counts contribute more to reach than repeated hashtags. Profile visits are often linked to new followers.
العناوين القصيرة وعدد الحفظات تلعب دورًا أكبر في الوصول من تكرار الهاشتاقات. كما أن زيارات الملف الشخصي ترتبط غالبًا بزيادة المتابعين.
Inspired by content from TheCleverProgrammer, Aman Kharwal, and Kaggle datasets.
استُلهم المشروع من محتوى TheCleverProgrammer وأمان خروال، وبيانات من Kaggle.
Feel free to open an issue or share suggestions!
يسعدنا تلقي ملاحظاتكم واقتراحاتكم عبر صفحة المشروع.
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Sample data for exercises in Further Adventures in Data Cleaning.