Analysis unit

Persons, households, and dwellings Age is grouped into categories

UNITS IDENTIFIED: - Dwellings: yes - Vacant Units: no - Households: yes - Individuals: yes - Group quarters: yes

UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Households: A private household comprises either one person living alone or a group of people (not necessarily related) living at the same address with common housekeeping arrangements - that is, sharing at least one meal a day or sharing a living room or sitting room. - Group quarters: Examples of non-private households are establishments or institutions. These include hotels, country clubs, guest houses, B

Universe

All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were excluded.

Kind of data

Population and Housing Census [hh/popcen]

Sampling procedure

MICRODATA SOURCE: Central Statistics Office

SAMPLE SIZE (person records): 365323.

SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.

Mode of data collection

Face-to-face [f2f]

Research instrument

There are 2 forms to be completed by households or individuals: (1) Form A - Census Form (or Schedule); and (2) Form A(P) - Personal Form. The information from Form A is used here.

The UK censuses took place on 21st April 1991. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The Northern Ireland Individual SAR is a 2% sample of individuals which was drawn from the full set of 1991 Census records. It was released to the then Census Microdata Unit (now the Centre for Census and Survey Research) in May 1994 who then undertook quality assurance work and produced documentation and additional derived variables.

The dataset contains 31,967 person records and 53 variables. A number of protections are in place to ensure the anonymity of cases in the data including the low sampling fraction, grouping of some rare categories, limitation of geographical detail and record reordering so that the cases are not ordered geographically.

Once the Household SAR (held under SN 7213) had been removed to avoid an overlap between the two files, remaining records were stratified into groups of 99 and two individuals were chosen from each group. Individuals in communal establishments were stratified geographically into groups of 50 people and one person was chosen at random from each group. Unlike Great Britain, 100% of Northern Ireland records were coded.

For many variables, the codes that are used in the Northern Ireland SARs differ from those used in the GB SARs. Where this is the case, the Northern Ireland coding follows on numerically from the GB coding but it will not necessarily start at 1 and have a value for every succeeding integer. For example, 'household family type' uses quite different coding to the nearest GB equivalent 'family type': the GB codes run from 00 through to 08, whilst the Northern Ireland codes pick up from 09 and run through to 23.

Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research Samples of Anonymised Records (SARS) website.

Variables included in the 1991 Northern Ireland Individual SAR include: age, sex, marital status, employment status, religion, occupation, industry, social class, accommodation, bath/shower and indoor toilet facilities, tenure, economic position and social class of family head; and some limited information on other members of household, e.g. number of persons with long-term illness, number of pensioners and number of earners.

Analysis unit

Persons, households, and dwellings

UNITS IDENTIFIED: - Dwellings: yes - Vacant Units: no - Households: yes - Individuals: yes - Group quarters: yes

UNIT DESCRIPTIONS: - Dwellings: A dwelling is a self contained living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Households: A private household comprises either one person living alone or a group of people (not necessarily related) living at the same address with common housekeeping arrangements - that is, sharing at least one meal a day or sharing a living room or sitting room. - Group quarters: Communal Establishments (CEs) or non-private households are establishments providing managed (full-time or part-time supervision) residential accommodation. This includes hotel, boarding house, guest house, bed and breakfast, hostel, educational establishment, religious community, children's home, nursing home, hospital/nurses' home, prison, defence establishment (including ships), civilian ships, boats and barges, garda station, and holiday campsite. Boarding houses with less than five boarders on Census Night are treated as private households.

Universe

All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were included but asked a subset of questions.

Kind of data

Population and Housing Census [hh/popcen]

Sampling procedure

MICRODATA SOURCE: Central Statistics Office

SAMPLE SIZE (person records): 474353.

SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.

Mode of data collection

Face-to-face [f2f]

Research instrument

There are 3 forms completed by the public: a. Household Form (main census form); b. Listing Form (for communal establishments only); and c. Individual Form. The information from the Household Form is used here.

Analysis unit

Persons and households

UNITS IDENTIFIED: - Dwellings: no - Vacant Units: no - Households: yes - Individuals: yes - Group quarters: no

UNIT DESCRIPTIONS: - Dwellings: A dwelling has a distinct outer door and shall be considered as one house, although it may be occupied by several families living in separate apartments, or what are known as tenements, under the same roof. - Households: A "distinct family" is defined as (a) a man and his wife or a man and his and children living together, and no other person residing with them or family such as either of the foregoing, with their relatives, servants, and visitors residing with them. (b) All persons occupying the same house common and boarding at the same table, and their servants. (c) A person living alone whether occupying the whole or a part of a house, with servants, if any. (d) Two or more lodgers boarding together distinct from the family and their servants, if any. - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc.

Universe

All persons present in Ireland at the time of census, including visitors and those in residence.

Kind of data

Population and Housing Census [hh/popcen]

Sampling procedure

MICRODATA SOURCE: The National Archives of Ireland

SAMPLE SIZE (person records): 4435023.

SAMPLE DESIGN: Full count

Mode of data collection

Face-to-face [f2f]

Research instrument

The information is based on Form A- Household Schedule. Form B reports summary tables of population figures.

This dataset provides Census 2021 estimates that classify usual residents in Northern Ireland by sex. The estimates are as at census day, 21 March 2021.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

This dataset provides a list of surnames that are reliably Irish and that can be used for identifying textual references to Irish individuals in the London area and surrounding countryside within striking distance of the capital. This classification of the Irish necessarily includes the Irish-born and their descendants. The dataset has been validated for use on records up to the middle of the nineteenth century, and should only be used in cases in which a few mis-classifications of individuals would not undermine the results of the work, such as large-scale analyses. These data were created through an analysis of the 1841 Census of England and Wales, and validated against the Middlesex Criminal Registers (National Archives HO 26) and the Vagrant Lives Dataset (Crymble, Adam et al. (2014). Vagrant Lives: 14,789 Vagrants Processed by Middlesex County, 1777-1786. Zenodo. 10.5281/zenodo.13103). The sample was derived from the records of the Hundred of Ossulstone, which included much of rural and urban Middlesex, excluding the City of London and Westminster. The analysis was based upon a study of 278,949 adult males. Full details of the methodology for how this dataset was created can be found in the following article, and anyone intending to use this dataset for scholarly research is strongly encouraged to read it so that they understand the strengths and limits of this resource:

Adam Crymble, 'A Comparative Approach to Identifying the Irish in Long Eighteenth Century London', _Historical Methods: A Journal of Quantitative and Interdisciplinary History_, vol. 48, no. 3 (2015): 141-152.

The data here provided includes all 283 names listed in Appendix I of the above paper, but also an additional 209 spelling variations of those root surnames, for a total of 492 names.

The UK censuses took place on 21st April 1991. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.

Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services.

The Northern Ireland Individual SAR is a 2% sample of individuals which was drawn from the full set of 1991 Census records. It was released to the then Census Microdata Unit (now the Centre for Census and Survey Research) in May 1994 who then undertook quality assurance work and produced documentation and additional derived variables.

The dataset contains 31,967 person records and 53 variables. A number of protections are in place to ensure the anonymity of cases in the data including the low sampling fraction, grouping of some rare categories, limitation of geographical detail and record reordering so that the cases are not ordered geographically.

Once the Household SAR (held under SN 7213) had been removed to avoid an overlap between the two files, remaining records were stratified into groups of 99 and two individuals were chosen from each group. Individuals in communal establishments were stratified geographically into groups of 50 people and one person was chosen at random from each group. Unlike Great Britain, 100% of Northern Ireland records were coded.

For many variables, the codes that are used in the Northern Ireland SARs differ from those used in the GB SARs. Where this is the case, the Northern Ireland coding follows on numerically from the GB coding but it will not necessarily start at 1 and have a value for every succeeding integer. For example, 'household family type' uses quite different coding to the nearest GB equivalent 'family type': the GB codes run from 00 through to 08, whilst the Northern Ireland codes pick up from 09 and run through to 23.

Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research Samples of Anonymised Records (SARS) website.

This dataset provides Census 2021 estimates for the number of households in Northern Ireland by accommodation type. The estimates are as at census day, 21 March 2021.

This spreadsheet contains 3 worksheets: a cover sheet; 1 sheet containing the data tables; and a notes sheet.

Data are available for Northern Ireland and the 11 Local Government Districts.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

Issues and corrections

DI002: Accommodation type

Census Office has noted differences in classification declared by a small number of respondents for accommodation type when compared to the accommodation type recorded by Land and Property Services (LPS) for the address. This can be explained by census respondents favouring selecting ‘semi-detached’ instead of ‘terraced (including end-terrace)’ for end-terrace properties.

Full details can be found on the NISRA website

This dataset provides Census 2021 estimates for the number of households in Northern Ireland. The estimates are as at census day, 21 March 2021.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

To find out how Data Zones and Super Data Zones have been developed, and how other Northern Ireland geographies can be approximated, please read the notes here

The quality assurance report can be found here

This dataset provides Census 2021 estimates that classify usual residents aged 3 and over in Northern Ireland by main language.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

This table reports the categories for which there are 10 or more usual residents. Where there are fewer than 10 usual residents for any category, these have been reported in a residual group which may or may not contain 10 or more usual residents in total.

Main language is reported as provided by respondents; those who stated 'Chinese' are recorded as 'Chinese (not otherwise specified)'. If a specific Chinese language has been stated, it is recorded separately.

Quality assurance report can be found here

This dataset provides Census 2021 estimates that classify usual residents in Northern Ireland by single year of age, and by sex. The estimates are as at census day, 21 March 2021.

The census collected information on the usually resident population of Northern Ireland on census day (21 March 2021). Initial contact letters or questionnaire packs were delivered to every household and communal establishment, and residents were asked to complete online or return the questionnaire with information as correct on census day. Special arrangements were made to enumerate special groups such as students, members of the Travellers Community, HM Forces personnel etc. The Census Coverage Survey (an independent doorstep survey) followed between 12 May and 29 June 2021 and was used to adjust the census counts for under-enumeration.

The main population base for published statistical tables from the 2011 Census in Northern Ireland is the usual resident population base as at Census day, 27 March 2011. By way of background, for 2011 Census purposes a usual resident of the United Kingdom (UK) is anyone who, on Census day, was in the UK and had stayed or intended to stay in the UK for a period of 12 months or more, or had a permanent UK address and was outside the UK and had intended to be outside the UK for less than 12 months. Against this background, the 2011 Census Microdata Sample of Anonymised Records (SARs) Teaching File comprises a sample of 19,862 records (approximately 1 per cent) relating to people who were usually resident in Northern Ireland at the time of the 2011 Census. For each individual, information is available for seventeen separate characteristics (for example, sex, age, marital status) to varying degrees of detail. Both the size of the sample and the content of the records in the file have been harmonised, wherever possible, with the equivalent SARs teaching file that the Office for National Statistics simultaneously released for England and Wales. Purpose The primary purpose of the teaching file, which comprises unit-record level data as opposed to statistical aggregates, is as an educational tool aimed at: encouraging wider use of Census data by facilitating another way of examining Census data, for example through the building of statistical models, over and above that already available through the raft of standard tabular output released to date; providing a broad insight into the sort of detail that is generally included in a SARs product, along with data formats and any associated metadata. This will enable users (arguably those less experienced at using SARs products) to ‘play’ with the data and increase their knowledge and skills in readiness for accessing the more detailed SARs products that are planned and will be available in, for example, a safe setting; and assisting with the teaching of statistics and geography at GCSE and higher levels.

The UK censuses took place on 29th April 2001. They were run by the Northern Ireland Statistics & Research Agency (NISRA), General Register Office for Scotland (GROS), and the Office for National Statistics (ONS) for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The 2001 Individual Licensed Sample of Anonymised Records (I-SAR) is a 3% sample of individuals for all countries of the United Kingdom, with approximately 1.84 million records. The data are available for England, Wales, Scotland and Northern Ireland. Information is included for each individual on the main demographic, health, socio-economic and household variables. The 3% sample is an increase by comparison with 2% in 1991. Some variables have been broad-banded to reduce disclosure risk. The lowest level of geography is the Government Office Region (GOR), although Inner and Outer London are separately identified. This represents a significant reduction by comparison with the 1991 where large Local Authorities (population 120,000 and over) were separately identified.

This dataset contains 89 variables; a version designed for imputation analysis, which contains an extra 84 imputation flag variables, is available under SN 7206.

The dataset includes information on age, gender, ethnicity, health, employment status, housing, amenities, family type, geography, social class, education, distance to work, workplace, hours worked and migration. In addition, the ONS have added occupational coding, not available in the Census tables, for individuals aged 16-65 who last worked more than 5 years ago but less than ten years ago and for those aged 65-74 who were not currently working at the Census but who had worked in the previous ten years.

The UK censuses took place on 29th April 2001. They were run by the Northern Ireland Statistics & Research Agency (NISRA), General Register Office for Scotland (GROS), and the Office for National Statistics (ONS) for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The 2001 Individual Licenced Sample of Anonymised Records for Imputation Analysis (I-SAR) is a 3% sample of individuals for all countries of the United Kingdom, with approximately 1.84 million records. The data are available for England, Wales, Scotland and Northern Ireland. Information is included for each individual on the main demographic, health, socio-economic and household variables. The 3% sample is an increase by comparison with 2% in 1991. Some variables have been broad-banded to reduce disclosure risk. The lowest level of geography is the Government Office Region (GOR), although Inner and Outer London are separately identified. This represents a significant reduction by comparison with the 1991 where large Local Authorities (population 120,000 and over) were separately identified.

This dataset contains 173 variables, including 84 imputation flag variables. The standard version, containing 89 I-SAR variables, is available under SN 7205.

The dataset includes information on age, gender, ethnicity, health, employment status, housing, amenities, family type, geography, social class, education, distance to work, workplace, hours worked and migration. In addition, the ONS have added occupational coding, not available in the Census tables, for individuals aged 16-65 who last worked more than 5 years ago but less than ten years ago and for those aged 65-74 who were not currently working at the Census but who had worked in the previous ten years. A further 84 imputation flag variables are also included.

Analysis unit

Persons, households, and dwellings Age is grouped into categories

UNITS IDENTIFIED: - Dwellings: yes - Vacant Units: no - Households: yes - Individuals: yes - Group quarters: yes

UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is defined as living accommodation which is occupied or, of vacant, is intended for occupation, by one household. - Households: A private household is defined as a group of persons living together (usually but not necessarily related), jointly occupying the whole or part of a private dwelling house, flat, or temporary dwelling and sharing a common budget. A person who lives alone or a person who occupies only part of the living accommodation but does not normally share a common budget with the other occupants is regarded as a separate household. - Group quarters: A non-private household is a boarding house, hotel, guest house, barrack, hospital, nursing home, boarding schools, religious institution, welfare institution, prison, or ship, etc. However, proprietors and manager of hotels, principals of boarding schools, persons in charge of various other types of institutions and members of staff who, with their families, occupy flats on the premises are considered as private households.

Universe

All persons present in Ireland at the time of census, including visitors and those in residence. Usual residents temporarily absent from the State and members of the Defence Forces, who on Census night, were serving abroad with the United Nations were excluded.

Kind of data

Population and Housing Census [hh/popcen]

Sampling procedure

MICRODATA SOURCE: Central Statistics Office

SAMPLE SIZE (person records): 344291.

SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.

Mode of data collection

Face-to-face [f2f]

Research instrument

There are 2 forms to be completed by households or individuals: (1) Form A - Census Household Schedule; and (2) Form A(P) - completed by persons in certain circumstances. The information from Form A is used here.

The UK censuses took place on 21st April 1991. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.

Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services.

The Northern Ireland Household Sample of Anonymised Records (SAR) is a 1% sample of households and all individuals in those households. It is a hierarchical file allowing linkages between individuals. The SARs were drawn from the fully coded set of Census records returned by households and institutions. They therefore omit wholly imputed households and also households that were missed by the Census.

The NI Household SAR contains 81 variables, similar to those in the Individual file. However, the structure of the file allows a large number of other variables to be derived.
The sampling strategy used is similar to that used in GB, however, while in GB only 10% of cases were fully coded, in Northern Ireland all cases were fully coded. Consequently the NI file was not drawn from a pre-existing 10% sample.

New variables have been created for the hierarchical household file since summary information about a household can be computed from data about the individuals in that household.

Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research Samples of Anonymised Records (SARS) website.

The UK censuses took place on 27 March 2011. They were run by the Northern Ireland Statistics & Research Agency (NISRA), National Records of Scotland (NRS), and the Office for National Statistics (ONS) for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics and underpin funding allocation to provide public services. This is the home for all UK census data. The 2011 Census Microdata Individual Safeguarded Sample (Local Authority): Northern Ireland data collection forms part of the statistical outputs from the 2011 Northern Ireland Census. A safeguarded microdata sample of individuals has been identified as a key Census user requirement, and was highlighted as part of a report specifying microdata products from the 2011 Census written by an expert user, Dr. Jo Wathan from the University of Manchester.

The purpose of a safeguarded sample of individuals is to be able to disseminate a detailed microdata file without onerous licensing conditions, by reducing the overall amount of detail compared to the secure samples. Whilst supplying sufficient detail on core variables to fulfil the intended aim of the microdata products, the safeguarded sample is a valuable multi-purpose research file that will be used on a wide range of projects. (For Censuses prior to 2011, these data may have been referred to as 'Samples of Anonymised Records', or SARSs.)

This safeguarded sample is of 5% of the total population at Local Authority level (Northern Ireland), and contain a similar level of detail to the equivalent End User Licence Census 2001 Microdata samples. A similar Northern Ireland dataset at Regional level is held under SN 7769. These samples have a low risk of disclosure; but not nil. Registered UK Data Service Census users can download the data to their laptops after agreeing terms and conditions that include constraints on data management under remote storage conditions.

Further information can be found on the Northern Ireland Statistics and Research Agency (NISRA) Census microdata webpage.

Corresponding Regional and Local Authority level data for England and Wales are held under SNs 7605 and 7682, and for Scotland under SNs 7834 and 7835.

Accommodation designed or adapted for health conditions; Central heating; Household size; Nature of communal establishment; Number of cars and vans; Pensioner household; Student accommodation; Tenure; Type of accommodation; Type of Establishment; Type of landlord; Whether accommodation is self-contained; Ability in Irish; Ability in Ulster Scots; Age of individual; Alternative Household Composition; Approximated social grade; Comparison of where you live and work; Country of birth; Distance moved from address one year ago; Done voluntary work without pay in the last year; Economic Activity; Employment type; English proficiency; Ethnicity; Ever worked; Exact pension age (on Census Day) indicator; Family status; General health; Hours worked per week; Household language; Age of Households Reference Person (HRP); Country of birth of HRP; National Statistics Socio-Economic Classification (NS-SeC) of HRP; Social grade of HRP; Industry of business; Intention to stay in the UK; Last year worked; Level of highest qualifications; Lived outside Northern Ireland for more than one year; Living arrangements; Long-term health problem; Main language; Marital Status; National identity; NS-SeC; Number of individuals in household with long-standing illness/disability; Number of people in household who provide care; Number of persons per room; Number of visitors on census night; Occupation; Passports held; Person of pensionable age indicator; Position within communal establishment; Provision of unpaid care; Relationship to HRP; Religion; Schoolchild or student in full-time education; Sex; Travel to work; Unemployment history; Usual address one year ago; Whether concealed family; Workers in generation one of family; Workplace or place of study; Year of Arrival in Northern Ireland.

The Marine Institute (formerly the Salmon Research Agency of Ireland and the Salmon Research Trust) operate permanent complete fish traps in the Burrishoole catchment, Co. Mayo, Ireland, as part of a program of long term ecological research (LTER). Data has been collected since 1970. All migrating diadromous fish are enumerated between their marine and freshwater habitats. The data contains census data, fecundity data, and data on the proportion of potential wild and captive-bred (ranched) Atlantic salmon (Salmo salar L.) sampled in the Burrishoole fish traps. The text file contains R code used in the analyses of relative reproductive success between captive and wild-bred Atlantic salmon and can be used to repeat such analyses. The associated text file also contains code relevant to calculating population productivity and the unbiased estimators of relative reproductive success. The Burrishoole fish traps have the following locations: Salmon leap: 53.920323, -9.584348 and Mill Race: 53.924081, -9.571727. As records do not specify which trap the specimens were sampled in, a midpoint of 53.922202 -9.578038 has been applied as the location data in the data distribution. None

Analysis unit

Persons, households, and dwellings Age is grouped into categories

UNITS IDENTIFIED: - Dwellings: yes - Vacant Units: no - Households: yes - Individuals: yes - Group quarters: yes

UNIT DESCRIPTIONS: - Dwellings: A dwelling unit is living accommodation which is occupied or, if vacant, is intended for occupation, by one or more households. - Households: A private household comprises either one person living alone or a group of people (not necessarily related) living at the same address with common housekeeping arrangements - that is, sharing at least one meal a day or sharing a living room or sitting room. - Group quarters: Communal Establishments (CEs) or non-private households, including, hotel, boarding house, guest house, bed and breakfast, hostel, educational establishment, religious community, children's home, nursing home, hospital/nurses' home, prison, defence establishment (including ships), civilian ships, boats and barges, garda station, and holiday campsite

Universe

All persons present in Ireland on the census night, including visitors and those in residence. Usual residents who were temporarily absent were included but asked a subset of questions.

Kind of data

Population and Housing Census [hh/popcen]

Sampling procedure

MICRODATA SOURCE: Central Statistics Office

SAMPLE SIZE (person records): 410688.

SAMPLE DESIGN: A 10% random sample of the recoded household records from each county was selected. The records within each county were sorted randomly before output to the sample file.

Mode of data collection

Face-to-face [f2f]

Research instrument

There are 5 forms completed by the public: a. Household Form ; b. Continuation Form; c. Listing Form ; d. Individual Form ; and d. Large Print Form. The information from the Household Form is us\ed here.

The UK censuses took place on 21st April 1991. They were run by the Census Office for Northern Ireland, General Register Office for Scotland, and the Office of Population and Surveys for both England and Wales. The UK comprises the countries of England, Wales, Scotland and Northern Ireland.Statistics from the UK censuses help paint a picture of the nation and how we live. They provide a detailed snapshot of the population and its characteristics, and underpin funding allocation to provide public services. The 1991 Individual Sample of Anonymised Records for Great Britain (SARs) represents a 2% sample of individuals enumerated in households and communal establishments in the 1991 Census. It consists of almost 1.2 million individual records. The SARs were drawn from the fully coded set of census records returned by households and institutions. They therefore omit wholly imputed households and also households that were missed by the Census. In total, 278 geographical areas are identified on the Individual SAR and include all large local authority districts with a population of at least 120,000 in the 1989 mid-year estimates. Smaller local authorities have been grouped together to form areas with populations over 120,000.

The Individual SAR was selected from the 10% sample of the 1991 Census from the remaining households after the removal of the Household SAR. This ensured that there were no overlapping cases in the two samples. Individuals in the remaining households were stratified into groups of nine, and two individuals were selected from each group at random. Individuals in communal establishments were stratified into groups of five, and one individual was selected at random from each group. The records were then scrambled to prevent the geographical tracing within a SAR area. In the Individual file there are two potential sources of clustering which arise in the sampling process. First, individuals are clustered into households in the selection of the 1% sample and second, the removal of the household SAR from the 1% sample implies a further clustering into households. Nonetheless, the Individual SAR approximates to a simple random sample.

Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research Samples of Anonymised Records website.

Variables included in the 1991 Individual SAR are: age, sex, marital status, employment status, occupation, industry, social class, accommodation, bath/shower and indoor toilet facilities, tenure, economic position and social class of family head; and some limited information on other members of household, e.g. number of persons with long-term illness, number of pensioners and number of earners.