Advantages of age specific fertility rate in 4 points
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Unlike the crude birth rate, the ASFR is unaffected by differences or changes in population age composition, and thus is more useful in comparing different populations or sub-groups and in measuring changes over time.
If age-specific fertility and mortality rates are constant for a long period of time, a population will approach a fixed age distribution, and fixed overall rates, which can be calculated from the specific rates. An assumption of stability may thus enable the indirect estimation of missing data when only a few population characteristics are known. Even when the assumption is not satisfied, the stable population model provides a useful approximation to the relationships among survivorship, reproduction, and age structure. Several applications are provided, ranging from the simple exponential model of population growth to models that estimate numbers of kin...
The most widely used such summary indicator in the fertility arena is the classic period total fertility rate (TFR), obtained by adding the age-specific fertility rates (i.e., type 2 rates) of a given year or period across ages 15 to 44 or 15 to 49. The result can be interpreted as the average number of children that women would bear, if they were to experience throughout their childbearing years the age-specific rates of the period in question. (For a modern underpinning of this classical interpretation, see Borgan and Hoem 1988.) It can also be seen as the average number of children per woman if the age-specific rates in question were to remain in force over a long period. Closely related to the classic total fertility rate are the gross reproduction rate (GRR) and the net reproduction rate (NRR). The GRR is simply the TFR confined to female births, and so represents the average number of daughters a woman would have if she experienced the age-specific female birth rates of a particular period.
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