The Aboriginal and Torres Strait Islander 2006 preliminary population estimates used in this report are based on the population counts from the five-yearly 2006 Census of Population and Housing (on a usual residence basis), adjusted for instances in which Indigenous status was unknown (not stated) and for net undercount. Unless otherwise indicated, rates in this publication have been based on the 2001 'low series' resident population estimates and projections.
Estimating the size and composition of the Indigenous population is difficult for a range of reasons, including the incomplete and differential Indigenous identification in births and deaths records across jurisdictions, which do not support the standard approach to population estimation. Indigenous identification is also incomplete in many other administrative data collections used in this report. The ABS and the AIHW, in partnership with state and territory authorities and the Indigenous community, are making efforts to improve the quality and completeness of Indigenous identification in key administrative data collections.