ERP TOTALS
4.10 The method to calculate ERP totals (i.e. not disaggregated by age or sex) for customised geography converts Census usual residence CD counts into CD ERPs, i.e. combining adjustments for net Census undercount, Australian residents temporarily overseas on Census Night (RTOs) and backdating components from the Census date to 30 June. In post-censal years, forcing (using iterative proportional fitting, see Appendix 5 - The iterative proportional fitting procedure) to post-censal SLA ERP implicitly adjusts the CD population for post-censal births, deaths and migration.
4.11 Adjustments for other known issues with Census data may also be made. For example, if a dwelling is counted in one CD, but should have been counted in another (within the same SLA) and this is not discovered in time to correct this record in the Census, adjustments can be made so the people in this dwelling are included in the correct CD for ERP purposes.
Method
Step 1
4.12 Calculate CD of usual residence population counts as at Census Night (from Census data), and adjust for any known issues with Census data.
Step 2
4.13 Extract SLA ERP totals from those published in Regional Population Growth, Australia (cat. no. 3218.0).
Step 3
4.14 Adjust the CD total population for post-censal years to reflect changes in the population implied by changes in the CD electoral enrolments since the Census year.
Step 4
4.15 Using iterative proportional fitting, force the updated CD totals to sum to the SLA ERP total.
Step 5
4.16 Aggregate CDs to the required geography.
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