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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]] | |||
Revision as of 16:25, 23 October 2013
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 , can be achieved by using the following formula:
In more developed countries where two child families are seen as the norm (or the proportion of women with two children who go on to have a third) is of critical importance in determining overall fertility levels.
is simply the proportion of women who become mothers.
References
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- ↑ Hinde, A (1998) "Demographic Methods", Hodder Arnold Publication.