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A parity progression ratios (PPR) is a measure commonly used in demography to study fertility. The PPR is simply the proportion of women with a certain number of children who go onto have another child. Calculating the PPR, also known as $a_{x}$ , can be achieved by using the following formula:

$a_{x} = (women with at least x + 1 children ever borne) / (women with at least x children ever born)$ ^[1]

In more developed countries where two child families are seen as the norm $a_{2}$ (or the proportion of women with two children who go on to have a third) is of critical importance in determining overall fertility levels.

$a_{0}$ is simply the proportion of women who become mothers.

References

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↑ Hinde, A (1998) "Demographic Methods", Hodder Arnold Publication.

[1] Hinde, A (1998) "Demographic Methods", Hodder Arnold Publication.

[1]

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+A '''parity progression ratios''' (PPR) is a measure commonly used in demography to study [[fertility]].  The PPR is simply the [[Proportionality (mathematics)|proportion]] of women with a certain number of children who go onto have another child.
+Calculating the PPR, also known as <math>a_x</math>, can be achieved by using the following [[formula]]:
+<math>a_x = \text{(women with at least } x+1 \text { children ever borne) }/\text{ (women with at least } x  \text{ children ever born)}</math><ref>Hinde, A (1998) "Demographic Methods", Hodder Arnold Publication.</ref>
+In more [[developed countries]] where two child families are seen as the norm <math>a_2 </math> (or the proportion of women with two children who go on to have a third) is of critical importance in determining overall fertility levels.
+<math>a_0</math> is simply the proportion of women who become mothers.
+== References ==
+{{Reflist}}
+[[Category:Human pregnancy]]

Flat vector bundle: Difference between revisions

Revision as of 15:25, 23 October 2013

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