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| Parity Progression Ratio× | Net Reproduction Rate× | |
|---|---|---|
| Tudományterület | Demográfia | Demográfia |
| Módszercsalád | Process / pipeline | Process / pipeline |
| Keletkezés éve≠ | 1953 | 2001 |
| Megalkotó≠ | Louis Henry (formalized in modern demography) | Richard Böckh and Robert Kuczynski (formalized in Preston, Heuveline & Guillot) |
| Típus≠ | Order-specific fertility measure built from a sequence of conditional progression probabilities | Period measure of generational replacement combining fertility and mortality |
| Alapmű | Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512 | Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512 |
| Alternatív nevek | PPR, Birth progression ratio, Parity progression probability, Doğum Sırası İlerleme Oranı | NRR, Net reproduction ratio, Net reproductive rate, Net Üreme Hızı |
| Kapcsolódó | 4 | 4 |
| Összefoglaló≠ | A parity progression ratio is the conditional probability that a woman who has already had a given number of children goes on to have one more. By converting a static parity distribution into a sequence of birth-by-birth transition probabilities, the method reveals where childbearing stops within a cohort and lets demographers rebuild completed fertility from the bottom up. It is the natural fertility analogue of a survival or life-table transition, treating each additional birth as a further step a woman may or may not take. | The net reproduction rate (NRR) is the demographic measure of generational replacement: the average number of daughters a woman would bear who survive to the age their mother was when she bore them, given the period's age-specific fertility rates and female mortality. By combining fertility with survival, the NRR answers the fundamental question of whether a population is replacing itself — an NRR of one means each generation of women exactly reproduces the next, below one signals long-run decline, and above one signals growth. |
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