Labour Force Survey (LFS) Reweighting Project 2007:
In 2007, ONS undertook a reweighting project, whereby LFS data were reweighted using population estimates for 2007-2008. As a result, reweighted editions of LFS household datasets back to 1997 (April-June quarters) and 2004 (October-December quarters) were deposited at the UKDA during 2008. These datasets are now available for download and via Nesstar.

For the reweighted datasets, users should note:

• a new household weight variable has been added, and the single year of age variable (AGE) and 4-digit unit SOC for main occupation have been reinstated. Further minor variable changes have been made to many of the datasets, and users should check the end of the individual catalogue record Abstract section and the study READ file for details
• only calendar datasets have been reweighted to 2007-2008 figures; the remaining seasonal datasets, which will no longer be updated by ONS, remain weighted to Census 2001 population figures. Seasonal datasets from 1997/2004 onwards that have been replaced by calendar quarters have been withdrawn from the UKDA catalogue

The next LFS/APS reweighting exercise to be undertaken will use 2009 population figures, and it is planned that revised datasets will be deposited accordingly during 2010.