REVIEW OF INTERSTATE MIGRATION METHOD
Unlike natural increase and net overseas migration, there is no direct measure of interstate migration for post annual quarters until the results of the next Population census become available. Instead, estimates of interstate migration are modelled using Medicare data on changes of address.
The model applied to Medicare data was reviewed in mid 2003. This review was primarily designed to update the expansion factors used to produce interstate migration estimates for the September quarter 2001 to the June quarter 2006, but also analysed the effect of lagging Medicare data, as well as different combinations of smoothing the Medicare and census data used to derive the expansion factors.
For further details on this review, please refer to Demography Working Paper 2004/1: Review of Interstate Migration Method (cat. no. 3106.0.55.001), available from the ABS web site.
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