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TECHNICAL NOTE 3 – THE AUSTRALIAN CENSUS LONGITUDINAL DATASET (ACLD)
The Australian Census Longitudinal Dataset (ACLD) was first released following the 2011 Census. The ACLD is a longitudinal probabilistically and deterministically-linked sample of Census records. At the time of this publication’s development two ACLD datasets were available, one linking a sample from the 2006 and 2011 Censuses and the other linking a sample from the 2011 and 2016 Censuses. A file linking a 5% sample across all three of these Censuses is planned for the future.
The ACLD provides a longitudinal picture of Australian society as captured by the Census. This includes allowing for analysis of persons who changed how they answered the Aboriginal and/or Torres Strait Islander Origin question between Census years. In total, the 2011-2016 ACLD contains 927,520 records that were linked between 2011 and 2016. Of these, 18,515 individuals identified as being Aboriginal, 1,174 as Torres Strait Islander only, and a further 802 as both Aboriginal and Torres Strait Islander. Of the rest of the sample, 9,948 did not have their Indigenous status stated, with the remaining 897,076 identified as being non-Indigenous.
Despite being the largest longitudinal dataset available, the sample of Aboriginal and Torres Strait Islander people in the ACLD is relatively small. This is due to a combination of the small proportion of the total population that is Aboriginal and Torres Strait Islander (2.9% in the ACLD) and of the lower linkage rates for Aboriginal and Torres Strait Islander persons. This is also an effect of the ACLD sample being for 5% of all Australians. Consequentially, the analysis presented below uses weighted counts instead of sample counts to ensure the data is as representative as possible. For more information on Aboriginal and Torres Strait Islander persons in the ACLD please refer to Information Paper: Australian Census Longitudinal Dataset, Methodology and Quality Assessment, 2011-2016 (cat. no. 2080.5).
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