The Labour Force Survey sample can be thought of as comprising eight sub-samples (or rotation groups), with each sub-sample remaining in the survey for eight months, and one rotation group “rotating out” each month and being replaced by a new group “rotating in”. This sample rotation is important in ensuring that seven-eighths of the sample are common from one month to the next, to ensure that changes in the estimates reflect real changes in the labour market, rather than the sample. In addition, the replacement sample is generally selected from the same geographic areas as the outgoing one, as part of a representative sampling approach.
When considering movements in the original estimates, it is possible to decompose the sample into three components:
- the matched common sample (survey respondents who responded in both May and June;
- the unmatched common sample (survey respondents who responded in June but who did not respond in May, or vice versa); and
- the incoming rotation group (survey respondents who replaced respondents who rotated out in May).
SOURCE: ABS. “6202.0 – Labour Force, Australia, Jun 2019” ABS, 18 July 2019.
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