Centre for Longitudinal Study Information and User Support (CeLSIUS): Research Support Unit for the ONS Longitudinal Study for England & Wales 2020-25

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CeLSIUS is a research support unit that enables research using the Office for National Statistics (ONS) Longitudinal Study for England and Wales- the largest nationally representative longitudinal dataset in the UK. Longitudinal studies follow the lives of individuals over a long period of time, showing us how people are affected by changes in society. The ONS Longitudinal Study contains the linked census data and some life events data of approximately one million sample members, collected over 40 years. This service is free to the user.The sample comprises people born on one of four selected dates of birth and therefore makes up about 1% of the total population. The sample was initiated at the time of the 1971 Census, and the five dates were used to update the sample at the 1981,1991 2001 and 2011 Censuses and in vital event registrations and registration of cancer. Thus, the ONS LS represents a continuous sample of the population of England and Wales, rather than a sample taken at one time point only. Information is also included for all people living in the same household as the ONS LS member whilst they live in the same household with the sample member. Full ONS LS members enter the study through birth on one of the four dates and immigration and existing members leave through death and emigration. The four dates are known only to a very small number of researchers based in ONS and the data is analysed in anonymised form and all results are published so that no one could be identified from them. To use the data the user must have an approved project and be an approved researcher. All research carried out must have public benefit. What type of research does CeLSIUS support: Associations between census data and event dataFor example: studies of associations between employment status and mortality, between economic status and cancer registrations, or between socio-economic factors and fertility; and survival analysis of mortality by area deprivation.Changes over time between censuses For example: analysis of patterns of retirement migration; studies of the effects of divorce and remarriage on housing tenure; or comparison of changes in education, employment and migration between different decades.Changes over time between event data setsStudies of changes in birth spacing or associations between fertility and cancer survival.Changes over time in population and sub groupsThis is especially useful for studies of ethnic or geographical factors.This project will continue to provide users with support in using the data and enable research to be carried out between 2020 and 2025.The 2021 census data when added will extend the data set to cover 50 years.