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Parity progression ratios

Measure used in demography to study fertility

Measure used in demography to study fertility

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 on to have another child. Calculating the PPR, also known as a_x, can be achieved by using the following formula:

a_x = \text{(women with at least } x+1 \text { children ever born) }/\text{ (women with at least } x \text{ children ever born)}

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

References

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