4430.0.30.002 - Microdata: Disability, Ageing and Carers, Australia, 2018 Quality Declaration 
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 24/10/2019   
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Survey Methodology

A summary of results and other information about the 2018 Survey of Disability, Ageing and Carers is available in the publication Disability, Ageing and Carers, Australia: Summary of Findings, 2018 (cat. no. 4430.0). Summary data tables, survey questionnaires and information on coding of long-term health conditions are available as Downloads. There is information about the specific definitions used in the survey (e.g. disability groups, carers), abbreviations and a glossary of terms. The Explanatory notes have information about survey design and operation, including:

    • sample design and scope
    • data collection methodology
    • weighting, benchmarks and estimation
    • data quality
    • interpreting the results.

Reliability of estimates

Each record on the household level and person level contains 60 replicate weights in addition to the main weight. By using these replicate weights, it is possible to calculate standard errors for weighted estimates produced from the microdata.

This method is known as Group Jackknife variance estimation. For more information on the Group Jackknife method of standard error estimation, see Research Paper: Weighting and Standard Error Estimation for ABS Household Surveys (Methodology Advisory Committee), July 1999 (cat. no. 1352.0.55.029).

Use of the 60 group Jackknife method for complex estimates, such as regression parameters from a statistical model, is not straightforward and may not be appropriate. The method as described does not apply to investigations where survey weights are not used, such as in unweighted statistical modelling.

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