Australian Bureau of Statistics
1504.0 - Methodological News, Dec 2004
Previous ISSUE Released at 11:30 AM (CANBERRA TIME) 05/01/2005
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CENSUS IMPUTATION FOR NON-RESPONDING DWELLINGS
The outcome of the review was that a new imputation methodology would be devised for non-responding dwellings that incorporated the credible source data as the best representation of non-respondents available. Following on from this analysis a variety of imputation methods were assessed, including:
The assessment involved reimputing 2001 non-respondents. The results were compared with the actual imputed values produced during 2001 Census processing.
All of the methods reduced the overcount by a desirable amount, and had similar levels of accuracy. The hotdecking method was ultimately selected because it imputes non-respondents with the same distribution of dwelling size as the credible source data. This is desirable because credible source records have a far higher proportion of one person households than the general population. Using hotdecking we impute 65 000 more one person households than were actually imputed for the 2001 Census. This has flow-on effects when we go on to impute other characteristics for system created records, such as age and marital status (ie small households are more likely to contain persons aged 20-35 and 55+ and less likely to contain persons aged 0-15).
Currently Population Census are working on a system to implement this method in readiness for testing in the 2005 Census Dress Rehearsal.
For further information, please contact, Claire Clarke on (02) 6252 5556
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This page last updated 13 September 2007