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&nbsp; <p>The <em>1981 Census Microdata Household File for Great Britain: 0.95% Sample</em> dataset was created from existing digital records from the 1981 Census under a project known as Enhancing and Enriching Historic Census Microdata Samples (EEHCM), which was funded by the Economic and Social Research Council with input from the Office for National Statistics and National Records of Scotland. The project ran from 2012-2014 and was led from the UK Data Archive, University of Essex, in collaboration with the Cathie Marsh Institute for Social Research (CMIST) at the University of Manchester and the Census Offices. In addition to the 1981 data, the team worked on files from the 1961 Census and 1971 Census. <br> <br> The original 1981 records preceded current data archival standards and were created before microdata sets for secondary use were anticipated. A process of data recovery and quality checking was necessary to maximise their utility for current researchers, though some imperfections remain (see the User Guide for details). Three other 1981 Census datasets have been created:</p> <ul><li>SN 8241 - <em>1981 Census Microdata Individual File for Great Britain: 5% Sample</em>, which contains information on individuals in larger local authorities, and is available to registered UK Data Service users based in the United Kingdom (see Access section for non-UK access restrictions);</li><li>SN 8243 - <em>1981 Census Microdata Teaching Dataset for Great Britain: 1% Sample: Open Access</em>, which can be used as a taster file and is freely available for anyone to download under an Open Government Licence; and</li><li>SN 8248 - <em>1981 Census Microdata for Great Britain: 9% Sample: Secure Access</em>, which comprises a larger population sample and so contains sufficient information to constitute personal data, meaning that it is only available to Accredited Researchers, under restrictive Secure Access conditions.</li></ul>

<p><span style="color: rgb(50, 49, 50); font-family: &quot;Open Sans&quot;, Helvetica, Arial, sans-serif; font-size: 14px;">The UK censuses took place on&nbsp;</span>21st April 1991<span style="color: rgb(50, 49, 50); font-family: &quot;Open Sans&quot;, Helvetica, Arial, sans-serif; font-size: 14px;">. 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.</span><br></p><p><span style="color: rgb(50, 49, 50); font-family: &quot;Open Sans&quot;, Helvetica, Arial, sans-serif; font-size: 14px;">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.</span></p> The <i>Northern Ireland Household Sample of Anonymised Records</i> (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. <br> <br> 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. <br> 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.<br> <br> 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.<br> <br> Further information, including guides and other documentation, may be found on the Cathie Marsh Centre for Survey Research <a href="http://www.ccsr.ac.uk/sars/" title="Samples of Anonymised Records">Samples of Anonymised Records</a> (SARS) website.<br> <br>

<p>The&nbsp;<em>1970 British Cohort Study</em>&nbsp;(BCS70) began in 1970 when data were collected about the births and families of babies born in the United Kingdom in one particular week in 1970. Since then, there have been nine further full data collection exercises in order to monitor the cohort members' health, education, social and economic circumstances. These took place when respondents were aged 5 in 1975, aged 10 in 1980, aged 16 in 1986, aged 26 in 1996, aged 30 in 1999-2000 (SN 5558), aged 34 in 2004-2005, aged 42 in 2012 and aged 46 in 2016-18. Cohort members have been surveyed throughout their childhood and adult lives, mapping their individual trajectories and creating a unique resource for researchers.&nbsp;</p><p>Featuring a range of objective measures and rich self-reported data, BCS70 covers an incredible amount of ground and can be used in research on many topics. It is one of very few longitudinal studies following people of this generation anywhere in the world.</p><p>Evidence from BCS70 has illuminated important issues for society across five decades. Key findings include how reading for pleasure&nbsp;matters for children’s cognitive development, why grammar schools have not reduced social inequalities, and how childhood experiences can impact on mental health in mid-life. Every day researchers from across the scientific community are using this important study to make new connections and discoveries.</p><p>Further information about the BCS70 and may be found on the&nbsp;<a title="Centre for Longitudinal Studies" href="http://www.cls.ioe.ac.uk/">Centre for Longitudinal Studies</a>&nbsp;website. As well as BCS70, the CLS now also conducts the NCDS series.</p><p>A range of BCS sub-sample and supplementary surveys have also been conducted, and a separate dataset covering response to BCS70 over all waves is available under SN 5641,&nbsp;<em>1970 British Cohort Study Response Dataset, 1970-2012.</em></p><p> </p><p><em>How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:</em><br>A useful overview of the governance routes for applying for genetic and bio-medical sample data, which are not available through the UK Data Service, can be found at&nbsp;<a title="Governance of data and sample access" href="http://www.metadac.ac.uk/data-access-through-metadac/">Governance of data and sample access</a>&nbsp;on the METADAC (Managing Ethico-social, Technical and Administrative issues in Data Access) website.</p> <p>The <span style="font-style: italic;">1970 British Cohort Study: Age 42, Sweep 9 Geographical Identifiers, 2001 Census Boundaries, 2012: Secure Access</span>&nbsp;data includes detailed sweep 9 geographical variables that can be linked to the main 42-year follow-up End User Licence data available under SN 7473. Users may apply for either but not both SN 8114 and SN 8115.<br><br><span style="font-weight: bold;">International Data Access Network (IDAN)</span><br>These data are now available to researchers based outside the UK. Selected UKDS SecureLab/controlled datasets from the Institute for Social and Economic Research (ISER) and the Centre for Longitudinal Studies (CLS) have been made available under the International Data Access Network (IDAN) scheme, via a Safe Room access point at one of the UKDS IDAN partners. Prospective users should read the&nbsp;<a href="https://ukdataservice.ac.uk/app/uploads/securelab-access-to-non-ons-data_idan.pdf" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS SecureLab application guide for non-ONS data for researchers outside of the UK via Safe Room Remote Desktop Access</a>. Further details about the IDAN scheme can be found on the&nbsp;<a href="https://ukdataservice.ac.uk/about/research-and-development/international-data-access-network-idan/" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS International Data Access Network</a>&nbsp;webpage and on the&nbsp;<a href="https://idan.network/" target="_blank" style="background-color: rgb(255, 255, 255);">IDAN</a>&nbsp;website.<br><br><span style="font-style: italic;">Latest edition information:<br></span>For the second edition (October 2018),&nbsp;the data and documentation have been updated.<br></p>

<p>The&nbsp;<span style="font-style: italic;">National Child Development Study</span>&nbsp;(NCDS) is a continuing longitudinal study that seeks to follow the lives of all those living in Great Britain who were born in one particular week in 1958. The aim of the study is to improve understanding of the factors affecting human development over the whole lifespan.&nbsp;<br><br>The NCDS has its origins in the&nbsp;<span style="font-style: italic;">Perinatal Mortality Survey</span>&nbsp;(PMS) (the original PMS study is held at the UK Data Archive under SN 2137). This study was sponsored by the National Birthday Trust Fund and designed to examine the social and obstetric factors associated with stillbirth and death in early infancy among the 17,000 children born in England, Scotland and Wales in that one week. Selected data from the PMS form NCDS sweep 0, held alongside NCDS sweeps 1-3, under SN 5565.&nbsp;<br><span style="font-style: italic;"><br>Survey and Biomeasures Data (GN 33004):</span><br>To date there have been nine attempts to trace all members of the birth cohort in order to monitor their physical, educational and social development. The first three sweeps were carried out by the National Children's Bureau, in 1965, when respondents were aged 7, in 1969, aged 11, and in 1974, aged 16 (these sweeps form NCDS1-3, held together with NCDS0 under SN 5565). The fourth sweep, also carried out by the National Children's Bureau,&nbsp;was conducted in 1981, when respondents were aged 23 (held under SN 5566). In 1985 the NCDS moved to the Social Statistics Research Unit (SSRU) - now known as the Centre for Longitudinal Studies (CLS). The fifth sweep was carried out in 1991, when respondents were aged 33 (held under SN 5567). For the sixth sweep, conducted in 1999-2000, when respondents were aged 42 (NCDS6, held under SN 5578), fieldwork was combined with the 1999-2000 wave of the&nbsp;<span style="font-style: italic;">1970 Birth Cohort Study</span>&nbsp;(BCS70), which was also conducted by CLS (and held under GN 33229). The seventh sweep was conducted in 2004-2005 when the respondents were aged 46 (held under SN 5579), the eighth sweep was conducted in 2008-2009 when respondents were aged 50 (held under SN 6137) and the ninth sweep was conducted in 2013 when respondents were aged 55 (held under SN 7669).&nbsp;<br><br>Four separate datasets covering responses to NCDS over all sweeps are available.&nbsp;<span style="font-style: italic;">National Child Development Deaths Dataset: Special Licence Access</span>&nbsp;(SN 7717) covers deaths;&nbsp;<span style="font-style: italic;">National Child Development Study Response and Outcomes Dataset</span>&nbsp;(SN 5560) covers all other responses and outcomes;&nbsp;<span style="font-style: italic;">National Child Development Study: Partnership Histories</span>&nbsp;(SN 6940) includes data on live-in relationships; and&nbsp;<span style="font-style: italic;">National Child Development Study: Activity Histories</span>&nbsp;(SN 6942) covers work and non-work activities. Users are advised to order these studies alongside the other waves of NCDS.<br><br>From 2002-2004, a Biomedical Survey was completed and is available under&nbsp;End User Licence (EUL) (SN 8731) and Special Licence (SL) (SN 5594).<br><br><span style="font-style: italic;">Linked Geographical Data (GN 33497):&nbsp;<br></span>A number of geographical variables are available, under more restrictive access conditions, which can be linked to the NCDS EUL and SL access studies.&nbsp;<br><br><span style="font-style: italic;">Linked Administrative Data (GN 33396):<br></span>A number of linked administrative datasets are available, under more restrictive access conditions, which can be linked to the NCDS EUL and SL access studies. These include a&nbsp;<span style="font-style: italic;">Deaths</span>&nbsp;dataset (SN 7717) available under SL and the&nbsp;<span style="font-style: italic;">Linked Health Administrative Datasets</span>&nbsp;(SN 8697) available under Secure Access.<br><br><span style="font-style: italic;">Additional Sub-Studies (GN 33562):<br></span>In addition to the main NCDS sweeps, further studies have also been conducted on a range of subjects such as parent migration, unemployment, behavioural studies and respondent essays. The full list of NCDS studies available from the UK Data Service can be found on the&nbsp;<a href="https://beta.ukdataservice.ac.uk/datacatalogue/series/series?id=2000032#!/access-data" target="_blank" style="background-color: rgb(255, 255, 255);">NCDS</a>&nbsp;series access data webpage.&nbsp;&nbsp;<br><br><span style="font-style: italic;">How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:<br></span>A useful overview of the governance routes for applying for genetic and bio-medical sample data, which are not available through the UK Data Service, can be found on the&nbsp;<a href="http://www.metadac.ac.uk/data-access-through-metadac/" target="_blank" style="background-color: rgb(255, 255, 255);">METADAC</a>&nbsp;(Managing Ethico-social, Technical and Administrative issues in Data Access) website.<br><br>Further information about the full NCDS series can be found on the&nbsp;<a href="https://cls.ucl.ac.uk/cls-studies/1958-national-child-development-study/" target="_blank" style="background-color: rgb(255, 255, 255);">Centre for Longitudinal Studies</a>&nbsp;website.&nbsp;<br></p> <i>NCDS5</i>:<br> The fifth sweep, carried out in 1991, was designed to obtain information from the cohort member, any husband, wife, or cohabitee, from the natural or adopted children of one in three cohort families, and from the mother of these children. The mother and child questionnaires are based on instruments used for the U.S. <i>National Longitudinal Survey of Youth, 1979</i> (NLSY79), specifically the <a href="http://www.bls.gov/nls/nlsy79ch.htm" title="NLSY79 Children and Young Adults"><i>NLSY79 Children and Young Adults</i></a> sweep. The inclusion of these questionnaires in NCDS5 is designed to enable cross-national and other comparisons to be made.<br> <br> The Centre for Longitudinal Studies updated the first six waves of NCDS in late 2006. Improvements made include further data cleaning and the addition of new documentation. <br> <br> For the second edition (August 2008), the serial number has been replaced with a new one, variable Ncdsid. This change has been made for all datasets in the NCDS series. Further information may be found in the ‘CLS Confidentiality and Data Security Review’, included in the documentation.<br><br>

<p><i>Background</i>:<br>The&nbsp;Millennium Cohort Study (MCS) is a large-scale, multi-purpose longitudinal dataset providing information about babies born at the beginning of the 21st century, their progress through life, and the families who are bringing them up, for the four countries of the United Kingdom. The original objectives of the first MCS survey, as laid down in the proposal to the Economic and Social Research Council (ESRC) in March 2000, were:</p><ul><li>to chart the initial conditions of social, economic and health advantages and disadvantages facing children born at the start of the 21st century, capturing information that the research community of the future will require</li><li>to provide a basis for comparing patterns of development with the preceding cohorts (the&nbsp;<i>National Child Development Study</i>, held at the UK Data Archive under GN 33004, and the&nbsp;<i>1970 Birth Cohort Study</i>, held under GN 33229)</li><li>to collect information on previously neglected topics, such as fathers' involvement in children's care and development</li><li>to focus on parents as the most immediate elements of the children's 'background', charting their experience as mothers and fathers of newborn babies in the year 2000, recording how they (and any other children in the family) adapted to the newcomer, and what their aspirations for her/his future may be</li><li>to emphasise intergenerational links including those back to the parents' own childhood</li><li>to investigate the wider social ecology of the family, including social networks, civic engagement and community facilities and services, splicing in geo-coded data when available</li></ul>Additional objectives subsequently included for MCS were:<ul><li>to provide control cases for the national evaluation of Sure Start (a government programme intended to alleviate child poverty and social exclusion)</li><li>to provide samples of adequate size to analyse and compare the smaller countries of the United Kingdom, and include disadvantaged areas of England</li></ul><p></p><p>Further information about the MCS can be found on the&nbsp;<a href="https://cls.ucl.ac.uk/cls-studies/millennium-cohort-study/" target="_blank" style="background-color: rgb(255, 255, 255);">Centre for Longitudinal Studies</a>&nbsp;web pages.<br><br>The content of MCS studies, including questions, topics and variables can be explored via the&nbsp;<a href="https://discovery.closer.ac.uk/item/uk.cls.mcs/0d8a7220-c61b-4542-967d-a40cb5aca430" style="background-color: rgb(255, 255, 255);">CLOSER Discovery</a>&nbsp;website.<br><br>The first sweep (MCS1) interviewed both mothers and (where resident) fathers (or father-figures) of infants included in the sample when the babies were nine months old, and the second sweep (MCS2) was carried out with the same respondents when the children were three years of age. The third sweep (MCS3) was conducted in 2006, when the children were aged five years old, the fourth sweep (MCS4) in 2008, when they were seven years old, the fifth sweep (MCS5) in 2012-2013, when they were eleven years old, the sixth sweep (MCS6) in 2015, when they were fourteen years old, and the seventh sweep (MCS7) in 2018, when they were seventeen years old.<br><br><span style="font-style: italic;">End User Licence versions of MCS studies</span>:<br>The End User Licence (EUL) versions of MCS1, MCS2, MCS3, MCS4, MCS5, MCS6 and MCS7 are held under UK Data Archive SNs 4683, 5350, 5795, 6411, 7464, 8156 and 8682 respectively. The&nbsp;longitudinal family file is held under SN 8172.<br><br><span style="font-style: italic;">Sub-sample studies</span>:<br>Some studies based on sub-samples of MCS have also been conducted, including a study of MCS respondent mothers who had received assisted fertility treatment, conducted in 2003 (see EUL SN 5559). Also, birth registration and maternity hospital episodes for the MCS respondents are held as a separate dataset (see EUL SN 5614).<br><br><span style="font-style: italic;">Release of Sweeps 1 to 4 to Long Format (Summer 2020)<br></span>To support longitudinal research and make it easier to compare data from different time points, all data from across all sweeps is now in a consistent format. The update affects the data from sweeps 1 to 4 (from 9 months to 7 years), which are updated from the old/wide to a new/long format to match the format of data of sweeps 5 and 6 (age 11 and 14 sweeps). The old/wide formatted datasets contained one row per family with multiple variables for different respondents. The new/long formatted datasets contain one row per respondent (per parent or per cohort member) for each MCS family. Additional updates have been made to all sweeps to harmonise variable labels and enhance anonymisation.&nbsp;&nbsp;<br><br><span style="font-style: italic;">How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:<br></span>A useful overview of the governance routes for applying for genetic and bio-medical sample data, which are not available through the UK Data Service, can be found at&nbsp;<a href="http://www.metadac.ac.uk/data-access-through-metadac/" title="Governance of data and sample access" target="_blank" style="background-color: rgb(255, 255, 255);">Governance of data and sample access</a>&nbsp;on the METADAC (Managing Ethico-social, Technical and Administrative issues in Data Access) website.<br><br><span style="font-weight: bold;">Secure Access datasets</span>:<br>Secure Access versions of the MCS have more restrictive access conditions than versions available under the standard End User Licence or Special Licence (see 'Access data' tab above).<br><br>Secure Access versions of the MCS include:</p><ul><li>detailed sensitive variables not available under EUL. These have been grouped thematically and are held under SN 8753 (socio-economic, accommodation and occupational data), SN 8754 (self-reported health, behaviour and fertility), SN 8755 (demographics, language and religion) and SN 8756 (exact participation dates). These files replace previously available studies held under SNs 8456 and 8622-8627<br></li><li>detailed geographical identifier files which are grouped by sweep held under SN 7758 (MCS1), SN 7759 (MCS2), SN 7760 (MCS3), SN 7761 (MCS4), SN 7762 (MCS5 2001 Census Boundaries), SN 7763 (MCS5 2011 Census Boundaries), SN 8231 (MCS6 2001 Census Boundaries), SN 8232 (MCS6 2011 Census Boundaries), SN 8757 (MCS7), SN 8758 (MCS7 2001 Census Boundaries) and SN 8759 (MCS7 2011 Census Boundaries). These files replace previously available files grouped by geography SN 7049 (Ward level), SN 7050 (Lower Super Output Area level), and SN 7051 (Output Area level)</li><li>linked education administrative datasets for Key Stages 1, 2 and 4 held under SN 8481 (England).&nbsp; This replaces previously available datasets for Key Stage 1 (SN 6862) and Key Stage 2 (SN 7712)<br></li><li>linked education administrative datasets for Key Stage 1 held under SN 7414 (Scotland) and SN 7415 (Wales)</li><li>linked NHS Patient Episode Database for Wales (PEDW) for MCS1 – MCS5 held under SN 8302</li><li>Banded Distances to English Grammar Schools for MCS5 held under SN 8394<br></li></ul><p><br>The linked education administrative datasets held under SNs 8481, 7414 and 7415 may be ordered alongside the MCS detailed geographical identifier files only if sufficient justification is provided in the application. The linked education administrative datasets are not available alongside the <span style="font-style: italic;">Hospital of Birth: Special Licence Access</span> dataset under SN 5724. Users are also only allowed access to either 2001 or 2011 of Geographical Identifiers Census Boundaries studies. So for MCS5 either SN 7762 (2001 Census Boundaries) or SN 7763 (2011 Census Boundaries), for the MCS6 users are only allowed either SN 8231 (2001 Census Boundaries) or SN 8232 (2011 Census Boundaries); and the same applies for MCS7 so either SN 8758 (2001 Census Boundaries) or SN 8759 (2011 Census Boundaries).<br><br>Researchers applying for access to the Secure Access MCS datasets should indicate on their ESRC Accredited Researcher application form the EUL dataset(s) that they also wish to access (selected from the MCS Series&nbsp;<a href="https://beta.ukdataservice.ac.uk/datacatalogue/series/series?id=2000031#!/access-data" target="_blank" style="background-color: rgb(255, 255, 255);">Access</a>&nbsp;web page).<br></p><p></p> <p><span style="font-weight: bold;">International Data Access Network (IDAN)</span><br>These data are now available to researchers based outside the UK. Selected UKDS SecureLab/controlled datasets from the Institute for Social and Economic Research (ISER) and the Centre for Longitudinal Studies (CLS) have been made available under the International Data Access Network (IDAN) scheme, via a Safe Room access point at one of the UKDS IDAN partners. Prospective users should read the&nbsp;<a href="https://ukdataservice.ac.uk/app/uploads/securelab-access-to-non-ons-data_idan.pdf" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS SecureLab application guide for non-ONS data for researchers outside of the UK via Safe Room Remote Desktop Access</a>. Further details about the IDAN scheme can be found on the&nbsp;<a href="https://ukdataservice.ac.uk/about/research-and-development/international-data-access-network-idan/" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS International Data Access Network</a>&nbsp;webpage and on the&nbsp;<a href="https://idan.network/" target="_blank" style="background-color: rgb(255, 255, 255);">IDAN</a>&nbsp;website.<br></p>

<p>The&nbsp;<em>1970 British Cohort Study</em>&nbsp;(BCS70) began in 1970 when data were collected about the births and families of babies born in the United Kingdom in one particular week in 1970. Since then, there have been nine further full data collection exercises in order to monitor the cohort members' health, education, social and economic circumstances. These took place when respondents were aged 5 in 1975, aged 10 in 1980, aged 16 in 1986, aged 26 in 1996, aged 30 in 1999-2000 (SN 5558), aged 34 in 2004-2005, aged 42 in 2012 and aged 46 in 2016-18. Cohort members have been surveyed throughout their childhood and adult lives, mapping their individual trajectories and creating a unique resource for researchers.&nbsp;</p><p>Featuring a range of objective measures and rich self-reported data, BCS70 covers an incredible amount of ground and can be used in research on many topics. It is one of very few longitudinal studies following people of this generation anywhere in the world.</p><p>Evidence from BCS70 has illuminated important issues for society across five decades. Key findings include how reading for pleasure&nbsp;matters for children’s cognitive development, why grammar schools have not reduced social inequalities, and how childhood experiences can impact on mental health in mid-life. Every day researchers from across the scientific community are using this important study to make new connections and discoveries.</p><p>Further information about the BCS70 and may be found on the&nbsp;<a title="Centre for Longitudinal Studies" href="http://www.cls.ioe.ac.uk/">Centre for Longitudinal Studies</a>&nbsp;website. As well as BCS70, the CLS now also conducts the NCDS series.</p><p>A range of BCS sub-sample and supplementary surveys have also been conducted, and a separate dataset covering response to BCS70 over all waves is available under SN 5641,&nbsp;<em>1970 British Cohort Study Response Dataset, 1970-2012.</em></p><p> </p><p><em>How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:</em><br>A useful overview of the governance routes for applying for genetic and bio-medical sample data, which are not available through the UK Data Service, can be found at&nbsp;<a title="Governance of data and sample access" href="http://www.metadac.ac.uk/data-access-through-metadac/">Governance of data and sample access</a>&nbsp;on the METADAC (Managing Ethico-social, Technical and Administrative issues in Data Access) website.</p> <p>The <span style="font-style: italic;">1970 British Cohort Study: Age 38, Sweep 8 Geographical Identifiers, 2008-2009: Secure Access</span>&nbsp;data includes detailed sweep 8 geographical variables that can be linked to the main 38-year follow-up End User Licence data available under SN 6557.<br><br><span style="font-weight: bold;">International Data Access Network (IDAN)</span><br>These data are now available to researchers based outside the UK. Selected UKDS SecureLab/controlled datasets from the Institute for Social and Economic Research (ISER) and the Centre for Longitudinal Studies (CLS) have been made available under the International Data Access Network (IDAN) scheme, via a Safe Room access point at one of the UKDS IDAN partners. Prospective users should read the&nbsp;<a href="https://ukdataservice.ac.uk/app/uploads/securelab-access-to-non-ons-data_idan.pdf" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS SecureLab application guide for non-ONS data for researchers outside of the UK via Safe Room Remote Desktop Access</a>. Further details about the IDAN scheme can be found on the&nbsp;<a href="https://ukdataservice.ac.uk/about/research-and-development/international-data-access-network-idan/" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS International Data Access Network</a>&nbsp;webpage and on the&nbsp;<a href="https://idan.network/" target="_blank" style="background-color: rgb(255, 255, 255);">IDAN</a>&nbsp;website.<br><br><span style="font-style: italic;">Latest edition information:<br></span>For the second edition (October 2018),&nbsp;the data and documentation have been updated.<br></p>

The&nbsp;<span style="font-style: italic;">National Child Development Study</span>&nbsp;(NCDS) is a continuing longitudinal study that seeks to follow the lives of all those living in Great Britain who were born in one particular week in 1958. The aim of the study is to improve understanding of the factors affecting human development over the whole lifespan.&nbsp;<br><br>The NCDS has its origins in the&nbsp;<span style="font-style: italic;">Perinatal Mortality Survey</span>&nbsp;(PMS) (the original PMS study is held at the UK Data Archive under SN 2137). This study was sponsored by the National Birthday Trust Fund and designed to examine the social and obstetric factors associated with stillbirth and death in early infancy among the 17,000 children born in England, Scotland and Wales in that one week. Selected data from the PMS form NCDS sweep 0, held alongside NCDS sweeps 1-3, under SN 5565.&nbsp;<br><span style="font-style: italic;"><br>Survey and Biomeasures Data (GN 33004):</span><br>To date there have been nine attempts to trace all members of the birth cohort in order to monitor their physical, educational and social development. The first three sweeps were carried out by the National Children's Bureau, in 1965, when respondents were aged 7, in 1969, aged 11, and in 1974, aged 16 (these sweeps form NCDS1-3, held together with NCDS0 under SN 5565). The fourth sweep, also carried out by the National Children's Bureau,&nbsp;was conducted in 1981, when respondents were aged 23 (held under SN 5566). In 1985 the NCDS moved to the Social Statistics Research Unit (SSRU) - now known as the Centre for Longitudinal Studies (CLS). The fifth sweep was carried out in 1991, when respondents were aged 33 (held under SN 5567). For the sixth sweep, conducted in 1999-2000, when respondents were aged 42 (NCDS6, held under SN 5578), fieldwork was combined with the 1999-2000 wave of the&nbsp;<span style="font-style: italic;">1970 Birth Cohort Study</span>&nbsp;(BCS70), which was also conducted by CLS (and held under GN 33229). The seventh sweep was conducted in 2004-2005 when the respondents were aged 46 (held under SN 5579), the eighth sweep was conducted in 2008-2009 when respondents were aged 50 (held under SN 6137) and the ninth sweep was conducted in 2013 when respondents were aged 55 (held under SN 7669).&nbsp;<br><br>Four separate datasets covering responses to NCDS over all sweeps are available.&nbsp;<span style="font-style: italic;">National Child Development Deaths Dataset: Special Licence Access</span>&nbsp;(SN 7717) covers deaths;&nbsp;<span style="font-style: italic;">National Child Development Study Response and Outcomes Dataset</span>&nbsp;(SN 5560) covers all other responses and outcomes;&nbsp;<span style="font-style: italic;">National Child Development Study: Partnership Histories</span>&nbsp;(SN 6940) includes data on live-in relationships; and&nbsp;<span style="font-style: italic;">National Child Development Study: Activity Histories</span>&nbsp;(SN 6942) covers work and non-work activities. Users are advised to order these studies alongside the other waves of NCDS.<br><br>From 2002-2004, a Biomedical Survey was completed and is available under&nbsp;End User Licence (EUL) (SN 8731) and Special Licence (SL) (SN 5594).<br><br><span style="font-style: italic;">Linked Geographical Data (GN 33497):&nbsp;<br></span>A number of geographical variables are available, under more restrictive access conditions, which can be linked to the NCDS EUL and SL access studies.&nbsp;<br><br><span style="font-style: italic;">Linked Administrative Data (GN 33396):<br></span>A number of linked administrative datasets are available, under more restrictive access conditions, which can be linked to the NCDS EUL and SL access studies. These include a&nbsp;<span style="font-style: italic;">Deaths</span>&nbsp;dataset (SN 7717) available under SL and the&nbsp;<span style="font-style: italic;">Linked Health Administrative Datasets</span>&nbsp;(SN 8697) available under Secure Access.<br><br><span style="font-style: italic;">Additional Sub-Studies (GN 33562):<br></span>In addition to the main NCDS sweeps, further studies have also been conducted on a range of subjects such as parent migration, unemployment, behavioural studies and respondent essays. The full list of NCDS studies available from the UK Data Service can be found on the&nbsp;<a href="https://beta.ukdataservice.ac.uk/datacatalogue/series/series?id=2000032#!/access-data" target="_blank" style="background-color: rgb(255, 255, 255);">NCDS</a>&nbsp;series access data webpage.&nbsp;&nbsp;<br><br><span style="font-style: italic;">How to access genetic and/or bio-medical sample data from a range of longitudinal surveys:<br></span>A useful overview of the governance routes for applying for genetic and bio-medical sample data, which are not available through the UK Data Service, can be found on the&nbsp;<a href="http://www.metadac.ac.uk/data-access-through-metadac/" target="_blank" style="background-color: rgb(255, 255, 255);">METADAC</a>&nbsp;(Managing Ethico-social, Technical and Administrative issues in Data Access) website.<br><br>Further information about the full NCDS series can be found on the&nbsp;<a href="https://cls.ucl.ac.uk/cls-studies/1958-national-child-development-study/" target="_blank" style="background-color: rgb(255, 255, 255);">Centre for Longitudinal Studies</a>&nbsp;website.&nbsp;<br> <p>The <span style="font-style: italic;">National Child Development Study: Age 23, Sweep 4 Geographical Identifiers, 1981: Secure Access&nbsp;</span>study includes sweep 4 detailed geographical variables, based on the 1981 Census Boundaries, that can be linked to the NCDS End User Licence (EUL) and Special Licence (SL) access studies listed on the <a href="https://discover.ukdataservice.ac.uk/series/?sn=2000032" target="_blank">NCDS series page</a>. Besides&nbsp;<a href="https://beta.ukdataservice.ac.uk/datacatalogue/studies/study?id=5566" target="_blank" style="background-color: rgb(255, 255, 255);">SN 5566 - National Child Development Study: Sweep 4, 1981, and Public Examination Results, 1978</a>, which is provided by default, users should indicate on their ESRC Research Proposal form all other Safeguarded dataset(s) that they wish to access alongside the study.<br><br>Repair work to the postcode level information held for NCDS 1974 was required prior to the production of this dataset, and involved extracting and coding addresses from original forms for this sweep. The work was funded and carried out by the Cohorts and Longitudinal Studies Enhancement Resources (CLOSER). For further information about CLOSER see <a href="https://www.closer.ac.uk/" target="_blank" style="background-color: rgb(255, 255, 255);">www.closer.ac.uk</a>.<br><br><span style="font-weight: bold;">International Data Access Network (IDAN)</span><br>These data are now available to researchers based outside the UK. Selected UKDS SecureLab/controlled datasets from the Institute for Social and Economic Research (ISER) and the Centre for Longitudinal Studies (CLS) have been made available under the International Data Access Network (IDAN) scheme, via a Safe Room access point at one of the UKDS IDAN partners. Prospective users should read the&nbsp;<a href="https://ukdataservice.ac.uk/app/uploads/securelab-access-to-non-ons-data_idan.pdf" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS SecureLab application guide for non-ONS data for researchers outside of the UK via Safe Room Remote Desktop Access</a>. Further details about the IDAN scheme can be found on the&nbsp;<a href="https://ukdataservice.ac.uk/about/research-and-development/international-data-access-network-idan/" target="_blank" style="background-color: rgb(255, 255, 255);">UKDS International Data Access Network</a>&nbsp;webpage and on the&nbsp;<a href="https://idan.network/" target="_blank" style="background-color: rgb(255, 255, 255);">IDAN</a>&nbsp;website.</p>

<p>The <i>Annual Population Survey</i> (APS) is a major survey series, which aims to provide data that can produce reliable estimates at local authority level. Key topics covered in the survey include education, employment, health and ethnicity. The APS comprises key variables from the <i>Labour Force Survey</i> (LFS) (held at the UK Data Archive under GN 33246), all its associated LFS boosts and the APS boost. Thus, the APS combines results from five different sources: the LFS (waves 1 and 5); the English <i>Local Labour Force Survey</i> (LLFS), the <i>Welsh Labour Force Survey</i> (WLFS), the <i>Scottish Labour Force Survey</i> (SLFS) and the <i>Annual Population Survey Boost Sample</i> (APS(B) - however, this ceased to exist at the end of December 2005, so APS data from January 2006 onwards will contain all the above data apart from APS(B)). Users should note that the LLFS, WLFS, SLFS and APS(B) are not held separately at the Archive. For further detailed information about methodology, users should consult the <i>Labour Force Survey User Guide</i>, selected volumes of which have been included with the APS documentation for reference purposes (see 'Documentation' table below).<br> <br> The APS aims to provide enhanced annual data for England, covering a target sample of at least 510 economically active persons for each Unitary Authority (UA)/Local Authority District (LAD) and at least 450 in each Greater London Borough. In combination with local LFS boost samples such as the WLFS and SLFS, the survey provides estimates for a range of indicators down to Local Education Authority (LEA) level across the United Kingdom.<br><br><span style="font-weight: bold;">2022 Reweighting: Revision of Grossing Factors to be done<br></span>Over the last year, the LFS team have been working on reweighting datasets to account for newly delivered RTI tax information, adjusting Northern Ireland non-responses, and fixing the grossing factors where England and Wales had been combined (rather than doing them separately). This culminated in the ongoing release of datasets, notably Annual Population Survey datasets released on 20 July (UKDS editions were released in August 2022).</p><p>It has since been identified that while two of these issues were revised, the grossing factors for England and Wales were not fully revised. This means that error remains in the calculation of some of the population weights in the Annual Population Survey and therefore the age breakdown of the population in both England and Wales remains affected to a small extent. The most recent datasets (Oct2020-Sep2021 and onwards) are not affected, and breakdowns for the UK as a whole would be largely unaffected. The affected annual datasets are for Apr2019-Mar2020 to Jul2020-Jun2021 inclusive, and these datasets will need to be revised. ONS anticipate this will be done in the labour market statistics release due on 13 September 2022. Further information will be released in due course.</p><div><b>End User Licence and Secure Access APS data</b><br></div><p> Users should note that there are two versions of each APS dataset. One is available under the standard End User Licence (EUL) agreement, and the other is a Secure Access version. The EUL version includes Government Office Region geography, banded age, 3-digit SOC and industry sector for main, second and last job. The Secure Access version contains more detailed variables relating to:</p><ul><li>age: single year of age, year and month of birth, age completed full-time education and age obtained highest qualification, age of oldest dependent child and age of youngest dependent child</li><li>family unit and household: including a number of variables concerning the number of dependent children in the family according to their ages, relationship to head of household and relationship to head of family</li><li>nationality and country of origin</li><li>geography: including county, unitary/local authority, place of work, Nomenclature of Territorial Units for Statistics 2 (NUTS2) and NUTS3 regions, and whether lives and works in same local authority district</li><li>health: including main health problem, and current and past health problems</li><li>education and apprenticeship: including numbers and subjects of various qualifications and variables concerning apprenticeships</li><li>industry: including industry, industry class and industry group for main, second and last job, and industry made redundant from</li><li>occupation: including 4-digit Standard Occupational Classification (SOC) for main, second and last job and job made redundant from</li><li>system variables: including week number when interview took place and number of households at address</li></ul>The Secure Access data have more restrictive access conditions than those made available under the standard EUL. Prospective users will need to gain ONS Accredited Researcher status, complete an extra application form and demonstrate to the data owners exactly why they need access to the additional variables. Users are strongly advised to first obtain the standard EUL version of the data to see if they are sufficient for their research requirements.<br> <br> <b>Documentation and coding frames</b><br> The APS is compiled from variables present in the LFS. For variable and value labelling and coding frames that are not included either in the data or in the current APS documentation (e.g. coding frames for education, industrial and geographic variables, which are held in LFS User Guide Vol.5, Classifications), users are advised to consult the latest versions of the LFS User Guides, which are available from the ONS <a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/labourforcesurveyuserguidance" title="Labour Force Survey - User Guidance" target="_blank">Labour Force Survey - User Guidance</a> webpages.<br> <br> <b>APS Well-Being Datasets</b><br> From 2012-2015, the ONS published separate APS datasets aimed at providing initial estimates of subjective well-being, based on the <i>Integrated Household Survey</i>. In 2015 these were discontinued. A separate set of well-being variables and a corresponding weighting variable have been added to the April-March APS person datasets from A11M12 onwards. <b>Users should no longer use the bespoke well-being datasets (SNs 6994, 6999, 7091, 7092, 7364, 7365, 7565 and 7566, but should now use the variables included on the April-March APS person datasets instead</b>. Further information on the transition can be found on the <a href="https://www.ons.gov.uk/peoplepopulationandcommunity/wellbeing/bulletins/measuringnationalwellbeing/2015to2016" title="Personal well-being in the UK: 2015 to 2016" target="_blank">Personal well-being in the UK: 2015 to 2016</a><br> <br> <b>Disability variables from 2013 onwards - LFS and APS</b><br> ONS have provided some information on changes since 2013 to the disability variables available on the LFS and APS. The Disability Discrimination Act (DDA) disabled (current disability) category within the historic DISCURR variable no longer corresponds with the advised legal definition of 'current disability'. DISCURR should only be available on LFS microdata from Spring 1998 to January-March 2013 (JM13); beyond that point users should ignore or delete it. In addition, the same 'DDA disabled (current disability)' category within variable DISCURR13 is also not the most appropriate variable to use because a) it is not comparable to the corresponding category in variable DISCURR due to question changes, and b) it no longer measures either the DDA definition of disability or the latest Equality Act definition of disability. However, DISCURR13 is available from the April-March 2013 quarter (AJ13) onwards and was introduced to demonstrate that the variables used to compile DISCURR had also changed from that quarter. Therefore, users are advised to use the disability variable DISEA from AJ13 onwards, which reflects the Equality Act 2010 legal definition of 'disabled', measured according to the <a href="http://www.ons.gov.uk/ons/guide-method/harmonisation/primary-set-of-harmonised-concepts-and-questions/long-lasting-health-conditions-and-illnesses--impairments-and-disability.pdf" title="GSS Harmonised Standard" target="_blank">GSS Harmonised Standard</a> on health conditions and illnesses. The harmonised disability variables DISEA and DISCURR13 should both be present on the APS person microdata from April 2013-March 2014 (A13M14) onwards. This ensures that APS users have a complete 12 months' data on which to base analysis of the variables. DISCURR should only be present on APS microdata up to and including April 2012-March 2013 (A12M13).<br> <br> <b>Variables DISEA and LNGLST</b><br> Dataset A08 (Labour market status of disabled people) which ONS suspended due to an apparent discontinuity between April to June 2017 and July to September 2017 is now available. As a result of this apparent discontinuity and the inconclusive investigations at this stage, comparisons should be made with caution between April to June 2017 and subsequent time periods. However users should note that the estimates are not seasonally adjusted, so some of the change between quarters could be due to seasonality. Further recommendations on historical comparisons of the estimates will be given in November 2018 when ONS are due to publish estimates for July to September 2018. <br> <br> An article explaining the quality assurance investigations that have been conducted so far is available on the <a href="https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/methodologies/analysisofthediscontinuityinthelabourforcesurveydisabilitydataapriltojune2017tojulytoseptember2017" target="_blank">ONS Methodology</a> webpage. For any queries about Dataset A08 please email Labour.Market@ons.gov.uk.<p></p><p><span style="font-weight: bold;">Occupation data for 2021 and 2022 data files</span><br> </p><p>The ONS have identified an issue with the collection of some occupational data in 2021 and 2022 data files in a number of their surveys. While they estimate any impacts will be small overall, this will affect the accuracy of the breakdowns of some detailed (four-digit Standard Occupational Classification (SOC)) occupations, and data derived from them. None of ONS' headline statistics, other than those directly sourced from occupational data, are affected and you can continue to rely on their accuracy. For further information on this issue, please see: <a href="https://www.ons.gov.uk/news/statementsandletters/occupationaldatainonssurveys">https://www.ons.gov.uk/news/statementsandletters/occupationaldatainonssurveys</a>.</p> <p><span style="font-weight: bold;">Latest edition information</span></p><p>For the second edition (February 2023), education variables HIQUAL22, HIQUL22D, LEVQUL22 and QUAL21_1 to QUAL21_39 have been replaced in the data file, with previous miscalculations corrected.<br></p>

The data covers job search activities and employment outcomes for participants in an online study on the provision of occupational recommendations to job seekers. Providing job search assistance to job seekers in a cost effective manner is a challenging goal. Interventions aimed at providing tailored advice typically involve large personnel costs that often dissipate the benefits. However, the advances in information technologies and the shift of formal job search to online platforms over the last 20 years offer new opportunities for providing advice at very low-cost. In this study we examine the potential for providing on-line advice to a population of hard-to-place job seekers. In a randomized field experiment, we provided suggestions about suitable alternative occupations to long-term unemployed job seekers. The suggestions were automatically generated, integrated in an online job search platform, and fed into actual search queries. Effects on the primary pre-registered outcomes of "finding a stable job" and "reaching a cumulative earnings threshold" are positive, large, and are more pronounced for those who are longer unemployed. Treated individuals include more occupations in their search and find more jobs in recommended occupations.

<p>A census of population is held every ten years in the UK, in England and Wales it is undertaken by the Office for National Statistics (ONS), in Scotland by the National Records of Scotland (NRS) and in Northern Ireland by the Northern Ireland Statistics and Research Agency (NISRA).&nbsp;</p><p><br></p><p>In England, Wales and Northern Ireland the latest census was taken on Sunday 21st March 2021. Due to issues around COVID-19, the census in Scotland was held a year later on 28th June 2022.&nbsp;&nbsp;</p><p><br></p><p>The census asks questions about you, your household and your home. In doing so, it helps to build a detailed snapshot of our society. Information from the census helps the government and local authorities to plan and fund local services, such as education, doctors' surgeries and roads.&nbsp;</p><p><br></p><p>Topics covered by the data released by the Census agencies include -&nbsp;&nbsp;</p><p><br></p><p>Demography and migration, UK armed forces veterans, ethnicity, national identity, language, religion, labour market, housing, sexual orientation, gender identity, education, health, disability and unpaid care.&nbsp;</p><p><br></p><p>The data in this series covers aggregate data at geographies from country level down to Output Area. Due to disclosure control (data can be blurred, changed or withheld to protect anonymity) not all datasets are available at all levels.&nbsp;</p><p><br></p>