All methodology

A working paper that explores different methodological options for Small Area Population Estimates in the transformed population estimation system

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

Quality and Methodology Information for Unexplained deaths in infancy: England and Wales, detailing the strengths and limitations of the data, methods used and data uses and users.

Quality and Methodology Information for domestic abuse detailing the strengths and limitations of the data, methods used and data uses and users.

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

Methodology guidance on national and subnational mid-year population estimates for England and Wales, which are broken down by administrative area, age, sex and components of population change.

This article brings together important information to inform users and explain any misunderstandings around our migration statistics.

An explanation of the methods used to produce the latest provisional statistics on migration flows into and out of the UK.

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.

Administrative data sources and quality assurance in the production of admin-based long-term international migration estimates published in bi-annual releases.