Valuer General Analysis of Valuer General data was undertaken by the ABS to identify and eliminate duplicate records, non-market transactions, land sales and data entry errors. These transactions have been removed from both the numerator and denominator in the computation. Survey of Income and Housing (SIH) The total sample in 2007-08 was 9 345 households, with a response rate of 84.0 per cent. Most of the non-response was due to householders that were not able to be contacted, and only one sixth of the non-response was due to households refusing to participate in the survey. To account in part for non-response, SIH data are weighted by: state; part of state; age; sex; labour force status; number of households; and household composition. National Aboriginal and Torres Strait Islander Social Survey (NATSISS) The NATSISS is conducted in all states and territories and includes remote and non-remote areas. The 2008 sample was 13 300 persons/6900 households, with a response rate of 82 per cent of households. In the absence of a comprehensive sampling frame, the 2008 NATSISS adopted a screening approach for locating its target population (compared to the more common approach of using a dwelling frame for general population surveys). Potential bias due to undercoverage in this screening approach was addressed by the application of adjustments to the initial weights, including adjustment based on the density of the Indigenous population in different areas. As undercoverage can result in variances across population characteristics, as well as across data items, caution should be exercised when interpreting the survey results. For more information see the 2008 NATSISS Quality Declaration. |