Reweighted Annual Population Survey (APS) estimates, including model-based unemployment estimates, were released at 09:30 on 18 May 2011. The complete series has been reweighted back to the Jan to Dec 2004 period in line with population estimates published in Summer 2010.

Background

The APS is a sample survey, so the responses reflect only a small proportion of the total population. Each respondent is given a weight relating to the proportion of the total population that he or she represents. The sum of all the weights equals the total household population for the survey. Reweighting means assigning different weights that are derived from more up-to-date population estimates.