Parity Progression Ratio PPR Calculator
Compute Brass parity progression ratios a(i), the share of women who have reached parity i and go on to parity i+1 or higher.
Description
Compute Brass parity progression ratios a(i), the share of women who have reached parity i and go on to parity i+1 or higher.
Compute Brass parity progression ratios a(i), the share of women who have reached parity i and go on to parity i+1 or higher.1
When to use Parity Progression Ratio PPR Calculator
Use this fertility measure when the births, women at risk, parity categories, and observation period follow the definition required by the selected method.
- Women by parity
- Number of women at each parity, starting with parity zero.
How the method works
- a(i)
- Progression ratio a(i) from each parity i to i+1.
Limitations and assumptions
Period and cohort fertility answer different questions. Survey recall, parity truncation, changing age patterns, union definitions, and mismatched exposure populations can materially change the result.
Alternative or Complementary measures
Pair period fertility with cohort measures, parity distributions, or wanted-fertility indicators when available. These complementary views separate timing changes from completed family size and stated preferences.
References
-
Total fertility rate — Wikipedia contributors
Similar or alternative tools
- Birth Interval Median By Parity Calculator
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- Child Woman Ratio CWR Calculator
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- Parity Distribution Percent Calculator
Convert counts of women at each parity into a percentage distribution of all women.