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5.1. Annual household estimates for 30 June of each year are published by state, by capital city / balance of state and by household size and age (number of persons aged 0 to 14 and number of persons aged 15 or over). For the purposes of household estimates, households can be generally considered analogous to occupied private dwellings (OPDs).
The following two sections discuss how census date estimates and the subsequent post-censal estimates are derived.
Census date household estimates (CDHE)
5.5. Household estimates for 30 June in the Census year are calculated at the SLA level by household size, using the following steps:
Step 1 - CDHE calculations.
5.6. Census counts of usual residents enumerated at home are compiled for each SLA by age (0 to 14 years, 15 years and over) and whether each person lived in an occupied private dwelling (OPD) or non-private dwelling (NPD). These counts are then used to estimate at the SLA level the percentage of people living in OPDs for each of the two age groups.
Step 2 - CDHE calculations.
5.8. Multiply the percentage of people living in OPDs for the two age groups by their respective SLA estimated resident populations. This provides an estimate of the number of persons living in OPDs.
Step 3 - CDHE calculations.
5.9. Compile census counts of OPDs (ie. dwellings, not persons) by SLA of enumeration by the number of persons in each OPD aged 15 years or over and the number of persons aged less than 15 years (see Table 5.1). The number of persons (by age) is calculated by adding the number of usual residents at home on census night (by age) to the number of persons temporarily absent on census night (by age). As such visitors are excluded and people temporarily absent are included.
Step 4 - CDHE calculations.
5.10. For each SLA, calculate the household population by household composition by age. This is done by multiplying the number of households for a given household composition by the number of persons in that age group (calculated in Step 3) for that household composition. For example, the number of persons aged 15 and over in households with 2 persons aged 15 and over and no persons aged less than 15 is equal to twice the number of households with 2 persons aged 15 and over and no persons aged less than 15.
Step 5 - CDHE calculations.
5.12. Separately prorate the census date household population by household composition calculated in Step 4 by age such that the total household population matches the 30 June estimate of the number of persons living in OPDs previously calculated in Step 2.
Step 6 - CDHE calculations.
5.13. Estimate the number of households by household composition through dividing the number of total persons (summed over age from Step 5) by the household size. For example, the number of households with 1 person aged 15 years and over and 3 persons aged less than 15 would be equal to the total number of persons living in these households divided by 4.
5.15. Using the census date (ie. 30 June) household estimates as the base population, post-censal household estimates are compiled in accordance with estimated resident population data and data obtained on household size propensities (by household composition) from the monthly Labour Force Survey (LFS).
The Labour Force Survey
5.16. The LFS is based on a multi-stage area sample of private dwellings and a list of non-private dwellings and covers about 0.5% of all persons aged 15 years and over who are usual residents of Australia. The survey excludes from scope members of the permanent Australian defence force, non-Australian diplomats, non-Australian diplomatic staff and non-Australian members of their families and members of non-Australian defence forces and their dependents.
Step 1 - PCHE calculations.
5.20. Estimate the proportion of persons living in private dwellings, separately according to State, part of State, age and sex by extrapolating the proportion of persons living in private dwellings as calculated using data from the two previous censuses. For example, for post-censal estimates for 1997 to 2001:
Step 2 - PCHE calculations.
5.21. Estimate the number of persons living in private dwellings, separately according to State, part of State, age and sex by multiplying the estimated resident population by its corresponding proportion of people living in private dwellings (as derived in Step 1 - PCHE calculations).
Step 3 - PCHE calculations.
5.22. Using pooled data from the LFS (as described in paragraph 5.18.), calculate (for each age, sex, State and part of State combination) the probability that such a person will live in a given household composition. These probabilities are referred to as household size propensities (Table 5.2).
Step 4 - PCHE calculations.
5.23. The Census provides the best basis for accurate estimates of the number of households in Australia. As household size propensities derived from LFS data for Census dates do not match Census-based household size propensities, the LFS-based household size propensities are adjusted to align with the Census-based household size propensities:
5.24. The adjusted household size propensities are re-scaled so they sum to one.
Step 5 - PCHE calculations.
5.25. For each State by part of State, age and sex combination, calculate the number of persons living in OPDs by household composition by proportionally distributing the estimated resident population living in OPDs (from Step 2 - PCHE calculations) according to the corresponding adjusted household size propensities (calculated in Step 4 - PCHE calculations).
Step 6 - PCHE calculations.
5.26. For each State by part of State, calculate the number of persons aged 15 or over living in OPDs by household composition by summing the person estimates from Step 5 - PCHE calculations over sex and the corresponding age groups.
5.29. As was the case in 5.11, for households of 4 or more persons aged 15 and over, the number of persons used is equal to the average number of persons aged 15 and over living in such households.