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Methods to produce provisional long-term international migration estimates
An explanation of the methods used to produce the latest provisional statistics on migration flows into and out of the UK.
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Admin-based long-term international migration estimates QMI
Quality and Methodology Information for long-term international migration statistics, detailing the strengths and limitations of the data, methods used, and data uses and users.
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National population projections, migration assumptions: 2020-based interim
The data sources and methodology used to produce migration assumptions in the 2020-based interim national population projections.
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International migration – terms, definitions and frequently asked questions
An introduction to the main concepts that underpin international migration statistics, including answers to frequently asked questions.
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Long-Term International Migration estimates and their reliability and accuracy
Understanding the reliability and accuracy of Long-Term International Migration estimates, including sampling distribution, sampling error, statistical significance and confidence intervals.
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Short-Term International Migration methodology – local authority estimates
An introduction to the main concepts that underpin Short-Term International Migration statistics for local authorities in England and Wales.
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Short-Term International Migration Estimates for England and Wales QMI
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International Passenger Survey: quality information in relation to migration flows
This background note provides an overview of the quality of the International Passenger Survey (IPS) for estimating international migration flows and has been updated following additional work carried out during 2017. This includes the implementation of electronic questionnaires on tablets to replace the current paper questionnaires, an out-of-hours pilot, and a comparison of how other countries measure long-term immigration.
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Short-Term International Migration methodology – national estimates
An introduction to the main concepts that underpin Short-Term International Migration statistics for England and Wales.
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Short-Term International Migration Estimates: Frequently Asked Questions