Stats NZ has a new website.

For new releases go to

www.stats.govt.nz

As we transition to our new site, you'll still find some Stats NZ information here on this archive site.

  • Share this page to Facebook
  • Share this page to Twitter
  • Share this page to Google+
Earthquakes and Statistics: The HLFS Experience

Emma Bentley, Chris Hansen, Michelle Smith and Nathan Young
Statistics New Zealand
info@stats.govt.nz

Abstract

The earthquakes that struck the Canterbury region on 4 September 2010 and 22 February 2011 had a significant impact on the region, and Statistics New Zealand’s ability to produce survey statistics. This paper focuses on how the earthquakes impacted on the Household Labour Force Survey (HLFS). The HLFS is designed to provide estimates of New Zealand’s labour force that are representative of the total working-age population. The representativeness of the sample was affected by the earthquakes as we were unable to interview households in affected areas for some time after each earthquake. The September earthquake did not introduce significant bias into the sample, however the February earthquake introduced significant bias at a regional level. With significant bias in the sample, an inaccurate picture of New Zealand’s labour force is presented. To preserve the quality of HLFS estimates the methodology was changed for the March 2011 quarter. This change resulted in March 2011 quarter estimates reflecting a picture of the labour market as if the earthquake never occurred. Through imputation, revisions to the March quarter estimates may be made to incorporate some of the effects of the earthquake. Looking forward, alterations to the usual methodology may be required for the June 2011 quarter. The method will not be finalised until after collection for the quarter is complete and an assessment has been made on the representativeness of the dataset.

pdf icon.  Earthquakes and Statistics: The HLFS Experience  (PDF, 178kb)

  • Share this page to Facebook
  • Share this page to Twitter
  • Share this page to Google+
Top
  • Share this page to Facebook
  • Share this page to Twitter
  • Share this page to Google+