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	Net Reproduction Rate	生命表解析
分野	人口学	人口学
系統	Process / pipeline	Survival analysis
提唱年	2001	1984
提唱者	Richard Böckh and Robert Kuczynski (formalized in Preston, Heuveline & Guillot)	Demographic/actuarial tradition; Chiang
種類	Period measure of generational replacement combining fertility and mortality	Age-structured mortality estimator
原典	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512	Chiang, C. L. (1984). The Life Table and Its Applications. Robert E. Krieger Publishing. ISBN: 978-0-89874-565-2
別名	NRR, Net reproduction ratio, Net reproductive rate, Net Üreme Hızı	Mortality Table, Actuarial Table, Survival Table, Yaşam Tablosu
関連	4	3
概要	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.	A life table is a systematic, age-structured summary of the mortality experience of a population. It traces a hypothetical cohort of births — conventionally 100,000 — through successive age intervals, recording how many survive, how many die, and how many person-years are lived at each interval. The method was formalized in its modern probabilistic form by Chiang (1984), synthesizing centuries of actuarial and demographic practice into a rigorous statistical framework applicable to human and biological populations alike.