Australian Bureau of Statistics 

1370.0  Measures of Australia's Progress, 2010
Previous ISSUE Released at 11:30 AM (CANBERRA TIME) 15/09/2010 
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This page last updated 13 November 2013

POPULATION GLOSSARY
Dependency ratio
The dependency ratio is a measure used to compare the size of the working age population to the size of the nonworking age population, calculated as the sum of people aged 014 and 65 years and over (that is, 'dependents') divided by the number of people aged 1564 years, multiplied by 100.
Estimated resident population (ERP)
ERP, the official measure of the population of Australia, is based on the concept of residence and was introduced in 1971. Prior to 1971, estimates of the population were based on the number of people actually present in Australia. ERP refers to all people, regardless of nationality or citizenship, who usually live in Australia, with the exception of foreign diplomatic personnel and their families. It includes usual residents who are overseas for less than 12 months. It excludes overseas visitors who are in Australia for less than 12 months.
Estimates of the Australian resident population are generated on a quarterly basis by adding natural increase (the excess of births over deaths) and net overseas migration (NOM) occurring during the period to the population at the beginning of each period. This is known as the cohort component method and can be represented by the following equation:
P_{(t+1)} = P_{(t)} + B  D + NOM
where P_{(t)} is the estimated resident population at time point t, P_{(t+1)} is the estimated resident population at time point t+1, B is the number of births occurring between t and t+1, D is the number of deaths occurring between t and t+1, and NOM is the net overseas migration occurring between t and t+1.
For state and territory population estimates, an additional term is added to the equation representing net interstate migration occurring between t and t+1, represented by the following equation:
P_{(t+1)} = P_{(t)} + B  D + NOM + NIM
Natural increase
Excess of births over deaths.
Net overseas migration (NOM)
Net overseas migration is the net gain or loss of population through immigration to Australia and emigration from Australia. It is:
Estimates for September quarter 2006 onwards use an improved methodology; caution should be exercised when comparing estimates over time.
Population growth
The sum of natural increase and net overseas migration.
Population projections
ABS population projections are not predictions or forecasts, but are simply illustrations of the growth and change in population which would occur if certain assumptions about future levels of fertility, mortality, internal migration and overseas migration were to prevail over the projection period. Three main series of projections, Series A, B and C, have been selected from a possible 72 individual combinations of the various assumptions. Series B largely reflects recent trends in fertility, life expectancy at birth, net overseas migration and net interstate migration, whereas Series A and Series C are based on high and low assumptions for each of these variables respectively.
Series A
The sum of agespecific fertility rates (live births at each age of mother per female population of that age). It represents the number of children a female would bear during her lifetime if she experienced current agespecific fertility rates at each age of her reproductive life.