Parity progression ratio
From Demography
Definition
The term parity progression ratio (PPR) is typically used in the context of a cohort of females (such as a birth cohort) that has completed its childbearing years. Given such a cohort, and a nonnegative integer , the parity progression ratio from birth order
to birth order
is defined as the ratio of the completed cohort fertility for that cohort for birth order
, to the completed cohort fertility for that cohort for birth order
.
Alternatively, the PPR describes the probability that a person in that cohort who has had children will proceed to have an
child.