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Labour Market Statistics: September 2015 quarter
Embargoed until 10:45am  –  04 November 2015
Revisions and corrections

Revisions to Household Labour Force Survey

Each quarter, we apply the seasonal adjustment process to the latest quarter and all previous quarters. Every estimate is subject to revision each quarter as new data is added, which means that seasonally adjusted estimates for previous quarters may change slightly. In practice, estimates more than two years from the end-point will change little.

The June 2015 quarter unemployment rate remained unchanged at 5.9 percent after we applied seasonal adjustment.

This table lists the changes in estimates between the current and previous quarters for the seasonally adjusted data. 

Percent revision from last estimate, seasonally adjusted
Quarter Male employed Female employed Male unemployed Female unemployed Male not in labour force Female not in labour force
Sep 2014 0.11 0.10 1.41 0.37 -0.27 -0.17
Dec 2014 -0.01 0.02 -0.65 -0.13 0.01 0.01
Mar 2015 0.00 0.01 -0.40 0.11 0.06 -0.01
Jun 2015 -0.12 -0.16 -0.21 -0.40 0.25 0.21

This table presents revisions for the trend estimates. Trend revisions are generally larger than those of the seasonally adjusted data.

Percent revision from last estimate, trend
Quarter Male employed Female employed Male unemployed Female unemployed Male not in labour force Female not in labour force

Sep 2014

0.03

0.15

0.53

0.05

-0.10

-0.23

Dec 2014

0.04

0.03

-0.07

0.12

-0.09

-0.12

Mar 2015

0.07

0.06

-0.46

0.04

-0.24

-0.16

June 2015

-0.37

-0.24

0.28

-0.74

1.04

0.53

The table below shows the average of all such absolute revisions, expressed relatively, and gives some indication to what extent the current estimates might be revised when the revised data for the next quarter becomes available.

Mean absolute percent revisions
Seasonally adjusted Trend
1-step 4-step 1-step 4-step
Male employed 0.05 0.08 0.16 0.17
Female employed 0.06 0.1 0.24 0.24
Male unemployed 0.48 0.8 1.78 1.84
Female unemployed 0.49 0.86 1.79 1.84
Male not in labour force 0.1 0.16 0.37 0.37
Female not in labour force 0.09 0.14 0.35 0.37

In the table above, a ‘1-step ahead’ revision is one made to an estimate one quarter later. For example, if in the March 2010 quarter the seasonally adjusted estimate of females employed was first published as 1,020,000, and then in the June 2010 quarter this same estimate was revised to 1,022,000, this would be an upward revision of 0.20 percent.

A ‘4-step ahead’ revision is one made to an estimate four quarters later. For example, if in the March 2010 quarter release the trend estimate of females not in the labour force was first published as 665,000 and then in the March 2011 release, one year later, the trend estimate of females not in the labour force for the March 2010 quarter was revised to 664,000, this would be a decrease of 1,000, or a downward revision of 0.15 percent.

Corrections

We have corrected some historical estimates in the Household Labour Force Survey (HLFS). When we introduced the population rebase (including regional benchmarks) on 31 March 2015, we updated all series in Infoshare – however, the following breakdowns were not correctly updated:

  • HLFQ.S2A - Labour Force Status by Ethnic Group by Regional Council (North Island and South Island breakdowns only) - December 2007 to December 2014
  • HLFQ.S8C - Youth NEET by Regional Council by Ag (North Island and South Island breakdowns only) - March 2004 to December 2014.

This incudes both quarterly and annual estimates. The errors were isolated to the North Island and South Island totals and are unlikely to have affected the interpretation of a trend.

We have now loaded the corrected estimates to Infoshare, and have corrected the zipped csv file in the ‘Downloads’ box for this release.

We apologise for any inconvenience.

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