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3106.0 - Demography News, Jan 2004  
Previous ISSUE Released at 11:30 AM (CANBERRA TIME) 11/02/2004   
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NEW EXPANSION FACTORS FOR ESTIMATING INTERSTATE MIGRATION FOR 2001 TO 2006

To estimate quarterly net interstate migration for 1996 to 2001 a combination of 1996 Census and Medicare movement data was used to determine, for selected ages, 'expansion factors' for inflating quarterly Medicare changes of address data. These factors allow for the fact that changes of address advised to Medicare may not adequately cover all interstate movements of persons of these ages.

Using 2001 Census interstate migration information ABS investigated the calculation of new expansion factors. The effects of different sets of expansion factors on intercensal error had they been used for the period 1996 to 2001 were considered. The best performing set of factors was chosen for use in estimating interstate migration for 2001 to 2006. The new expansion factors were introduced for the June quarter 2003.

For more information please contact Matthew Montgomery on (02) 6252 6487 or matthew.montgomery@abs.gov.au


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