Guidance

Changes to DWP households’ and pensioners’ incomes statistics 2015/16: statistical notice

Statistical notice about changes in the DWP Households Below Average Income and Pensioners’ Incomes Series statistics publications.

Documents

DWP Households Below Average Income and Pensioners’ Incomes Series statistical notice: measuring uncertainty

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Details

This Department for Work and Pensions (DWP) statistical notice advises users of a change in methodology for measuring uncertainty in future:

  • Households Below Average Income (HBAI) statistics
  • Pensioners’ Income Series (PI) statistics

This change will take effect for the 2015/16 publication, pre-announced for publication at 16 March 2017.

The new methodology provides an improved measure of uncertainty around key HBAI and related PI estimates by:

  • creating resamples of the HBAI dataset by simulating stratified, cluster sampling for Great Britain (GB) and stratified sampling for Northern Ireland (NI)
  • creating a unique set of grossing factors for each resample using the HBAI grossing process to gross the GB and NI resamples to the United Kingdom (UK) population

The old methodology used a simpler technique of creating simple random resamples of the UK HBAI dataset and re-using the original HBAI grossing factors.

Published 16 February 2017