There are four principal sources of error in Census data: respondent error, processing error, partial response and undercount. Results from the post-enumeration survey reveal an undercount of the Indigenous population. This undercount may introduce bias into the results which may affect comparability of estimates among jurisdictions. The net undercount for all Indigenous Australians was estimated at 11.5 per cent, calculated as the difference between the Census count of Indigenous people and the estimated Indigenous population on Census night (note that people who were counted in the Census but whose Indigenous status was not stated are included in estimates of net undercount). Estimates of the Indigenous net undercount for all jurisdictions are included below: Estimated Indigenous net undercount by state/territory Undercount rate % NSW 8.6 Vic. 9.4 Qld 11.6 SA 8.6 WA 16.6 Tas. 8.8 NT 16.0 ACT 8.8 Source: ABS 2008 (Cat no. 3238.0.55.001). The quality of information on qualifications is also affected by the level of detail provided and the ease with which responses can be coded. Quality statements for the data items are available, which include further information on non-response, see particularly: Type of Educational Institution Attended, Non-School Qualification, and Indigenous Status. |