Australian Bureau of Statistics
2940.0 - Census of Population and Housing - Details of Undercount, 2011
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 21/06/2012
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TECHNICAL NOTE 5 STATISTICAL IMPACT OF ADL
8 The Statistical Impact Study sample provided the average number of matches for each ADL-enabled match within these imputation groups, as well as an average number of Statistical Impact Study matches for the small number of persons unmatched in ADL-enabled processing. These averages were then applied to the rest of the PES sample, together with the outcomes of some vague address modelling (which was a feature of 2006 processing made redundant by ADL).
9 Once the imputation work was complete, the file was then run through the same person weighting and estimation processes used to produce the published 2011 PES estimates. The format of the estimates output was therefore directly comparable to the main estimates produced via the ADL-enabled processing method.
10 The ADL Statistical Impact Study estimated that the use of ADL in 2011 PES linking and matching resulted in a net undercount that was 246,985 persons less than the 2006 PES matching methodology would have delivered.
11 The Statistical Impact Study result has a standard error of 43,000. A common approach to assessing the variability inherent in estimates is to examine the 95% confidence interval (which is two standard errors either side of the estimate). Using this approach, there is a 95% chance that the true value of the statistical impact of ADL on net undercount in 2011 is between 160,985 and 332,985 persons.
12 It is important to remember that the Statistical Impact Study estimate was not designed to provide an alternative measure of net undercount for 2011, in 2006 terms, but only to identify the impact of the ADL methodology. There are a range of PES and Census changes that are not related to ADL that will affect comparability between 2006 and 2011. For instance, the reduced level of Census imputation in 2011 will directly affect the comparability of net undercount measures with their 2006 equivalents.
13 The ADL Statistical Impact Study reinforces the value in the ABS continuing to make innovative changes to the PES, especially in developing linking and matched methods that provide a more accurate estimate of the completeness of Census coverage.
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This page last updated 20 June 2012