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Abstract copyright UK Data Service and data collection copyright owner. The 1981 Census Microdata Household File for Great Britain: 0.95% Sample 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. 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: SN 8241 - 1981 Census Microdata Individual File for Great Britain: 5% Sample, 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);SN 8243 - 1981 Census Microdata Teaching Dataset for Great Britain: 1% Sample: Open Access, which can be used as a taster file and is freely available for anyone to download under an Open Government Licence; andSN 8248 - 1981 Census Microdata for Great Britain: 9% Sample: Secure Access, 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.Main Topics:The file links household members together to...