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  • Local Authority data

    Released on: 13 January 2016 | Corporate Information

    Quality indicators, imputation rates and One Number Census quality assurance information for each local authority in England and Wales.

  • Country and regional public sector finances QMI

    Released on: 07 June 2024 | Methodology

    Quality and Methodology Information (QMI) report for country and regional public sector finances, detailing the strengths and limitations of the data, methods used, and data uses and users.

  • Response rates

    Released on: 13 January 2016 | Corporate Information

    Household and person response rates.

  • Opinions and Lifestyle Survey QMI

    Released on: 16 May 2025 | Methodology

    Quality and Methodology Information for the Opinions and Lifestyle Survey (OPN), including strengths and limitations, recent improvements and quality characteristics.

  • Confidence intervals

    Released on: 13 January 2016 | Corporate Information

    95% confidence intervals for the 2001 Census result.

  • Linkage methods for Census 2021 in England and Wales

    Released on: 15 December 2022 | Methodology

    Matching Census 2021 to the Census Coverage Survey (CCS) using deterministic, probabilistic, associative, machine learning and clerical methods.

  • Census 2021 general report full version

    Released on: 17 June 2025 | Corporate Information

    Information about Census 2021: General Report for England and Wales and links to download the report in full.

  • UK Health Accounts QMI

    Released on: 30 April 2025 | Methodology

    Quality and methods information for the UK health accounts.

  • Imputation rates

    Released on: 13 January 2016 | Corporate Information

    Imputation rates for key variables for local authorities and wards.

  • How to compare and interpret ONS productivity measures

    Released on: 11 May 2020 | Methodology

    Explains how to compare and understand the three measures of productivity produced by the ONS, especially public service productivity, with details on inputs, output and coverage.