All methodology

  • Housing quality information for Census 2021

    Methodology | Released on 6 March 2024

    Quality information affecting housing data from Census 2021 in England and Wales to help users correctly interpret the statistics.

    Keywords: housing, quality, rooms, communal establishments

  • User guide to Census 2021 microdata samples, England and Wales

    Methodology | Released on 21 December 2023

    Supporting information for microdata samples from Census 2021 in England and Wales, including how to access and use public, safeguarded, Integrated Public Use Microdata Series (IPUMS) and secure microdata samples.

    Keywords: microdata, user guide

  • Veterans’ Survey 2022 to Census 2021 linkage report

    Methodology | Released on 15 December 2023

    Methods used to link the Veterans' Survey 2022 to Census 2021 deterministically.

    Keywords: linkage, veterans, survey, forces, census

  • User guide to Census 2021 Origin-destination data, England and Wales

    Methodology | Released on 1 December 2023

    Supporting information for origin-destination data from Census 2021 in England and Wales, including how to access and use public, safeguarded and secure datasets.

    Keywords: origin-destination, flow data, migration, commuting

  • Quality and methodology information (QMI) for Census 2021

    Methodology | Released on 23 November 2023

    Details the strengths, limitations, uses, users and methods used for Census 2021, England and Wales.

    Keywords: population, data collection, , data collection, response rate, quality assurance, accuracy

  • Population statistics and sources guide

    Methodology | Released on 17 November 2023

    A comparison of the different types of population estimate that are published on the ONS website or planned for future publication. Includes information about whether these are official estimates of the population or used only for wider research, as well as the sources, coverage and main uses and comparability issues for the estimate.

    Keywords: population statistics transformation, census 2021

  • Sexual orientation and gender identity quality information for Census 2021

    Methodology | Released on 1 November 2023

    Known quality information affecting sexual orientation and gender identity data from Census 2021 in England and Wales to help users correctly interpret the statistics.

    Keywords: sexual orientation, gender identity, quality, census

  • Welsh language quality information for Census 2021

    Methodology | Released on 26 October 2023

    Quality information affecting Welsh language data from Census 2021 to help correctly interpret them.
  • Demography and migration quality information for Census 2021

    Methodology | Released on 6 September 2023

    Known quality information affecting demography, migration and international migration data from Census 2021 in England and Wales.

    Keywords: demography, migration, quality information, demography, migration, quality information, quality concerns, census, census

  • Census 2021 to Personal Demographics Service linkage report

    Methodology | Released on 23 August 2023

    Methods used to link Census 2021 to the Personal Demographics Service (PDS) using deterministic and probabilistic methods.