Methodology - Swyddfa Ystadegau Gwladol

Subnational population projections QMI

Rhyddhawyd ar: 17 July 2025
Methodoleg

Quality and methodology information for subnational population projections, detailing the strengths and limitations of the data, methods used and data uses and users.

Comparing subnational population projections to estimates report

Rhyddhawyd ar: 24 June 2025
Methodoleg

Methodology article comparing the 2012-, 2014-, 2016- and 2018-based subnational population projections for 2021 with the 2021 mid-year estimates for England. Analysis includes the impact of rebasing and different components of change on SNPP accuracy.

Methodology used to produce the 2022-based subnational population projections for England

Rhyddhawyd ar: 24 June 2025
Methodoleg

Methods, data and components used to produce subnational population projections

National population projections, migration assumptions: 2022-based

Rhyddhawyd ar: 28 January 2025
Methodoleg

The data sources and methodology used to produce migration assumptions in the 2022-based national population projections.

Comparing national population projections to estimates report

Rhyddhawyd ar: 28 January 2025
Methodoleg

Methodology on the comparison of national population projections from 1971 to 2022 with population estimates, births, long-term international migration, and deaths, including measures of error.

National population projections, background, methodology and assumption setting: 2022-based

Rhyddhawyd ar: 28 January 2025
Methodoleg

Information on the data, methods and assumption setting process used to produce the 2022-based national population projections.

National population projections quality and methodology information

Rhyddhawyd ar: 28 January 2025
Methodoleg

Quality and methodology information for national population projections, detailing the strengths and limitations of the data, methods used and data uses and users.

National population projections, variant projections: 2022-based

Rhyddhawyd ar: 28 January 2025
Methodoleg

The variant projections, a range of scenarios with alternative demographic assumptions, used in the 2022-based national population projections.

National population projections, mortality assumptions: 2022-based

Rhyddhawyd ar: 28 January 2025
Methodoleg

The data sources and methodology used to produce mortality assumptions in the UK 2022-based national population projections.

National population projections, fertility assumptions: 2022-based

Rhyddhawyd ar: 28 January 2025
Methodoleg

The data sources and methodology used to produce fertility assumptions in the 2022-based national population projections.

Methodology related to population projections

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