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Part 4 Changes from Previous Surveys
CHANGES FROM PREVIOUS SURVEYS
There have been a number of changes made to the SIH since it was first conducted in 1994-95. These may have an impact on the assessment of changes over time.
The 2005-06 SIH was similar to the SIH run in 2003-04. Section 4.1 outlines the differences between the two surveys.
A number of major changes were introduced in the 2003-04 SIH. The changes were largely designed to improve survey quality but may impact on the comparability between the 2003-04 estimates and earlier data. It is generally not possible to quantify the extent of the discontinuity. Section 4.2 outlines the main changes while Appendix 5 presents an assessment of the aggregate impact of the 2003-04 changes on income measures.
The surveys from 1994-95 to 2002-03 are comparable. Section 4.3 provides information on the minor differences.
The final sample size for SIH cycles from 1994-95 is shown in Table 4.1. The sample size can give an indication of the reliability of the estimates produced from the surveys.
Table 4.1 Previous SIH sample sizes |
|  |
| Capital city | Balance of state | Total | |
| |
| 1994-95 | 4 438 | 2 381 | 6 819 | |
| 1995-96 | 4 588 | 2 375 | 6 963 | |
| 1996-97 | 4 715 | 2 530 | 7 245 | |
| 1997-98 | 4 649 | 2 376 | 7 025 | |
| 1999-2000 | 4 327 | 2 310 | 6 637 | |
| 2000-01 | 4 397 | 2 389 | 6 786 | |
| 2002-03 | 6 657 | 3 554 | 10 211 | |
| 2003-04 | 7 077 | 4 284 | 11 361 | |
| 2005-06 | 6 405 | 3 556 | 9 961 | |
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