手法を比較

	Singulate Mean Age at Marriage	Child-Woman Ratio
分野	人口学	人口学
系統	Process / pipeline	Process / pipeline
提唱年	1953	1900
提唱者	John Hajnal	Established demographic indicator (census-based)
種類	Indirect estimate of mean age at first marriage from census proportions	Indirect fertility index from a single census age-sex distribution
原典	Hajnal, J. (1953). Age at marriage and proportions marrying. Population Studies, 7(2), 111–136.	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512
別名	SMAM, Hajnal's Mean Age at Marriage, Singulate Mean Age at First Marriage	CWR, Child-to-woman ratio, Census fertility ratio, Çocuk-Kadın Oranı
関連	4	4
概要	The singulate mean age at marriage (SMAM) is an indirect demographic estimate of the average age at first marriage, computed entirely from the proportions of people who have never married by age, as recorded in a single census or survey. Introduced by John Hajnal in 1953, it sidesteps the need for registered marriage dates: by treating the never-married proportions as a synthetic-cohort survival curve in the single state, it recovers the mean number of years lived single before first marriage among those who eventually marry.	The child-woman ratio is the number of young children, usually those under five, per woman of reproductive age in a population. Computed from a single census age-sex distribution, it is the simplest indirect indicator of fertility, designed for settings where birth registration is absent or unreliable. Because young children are the surviving product of recent births, their number relative to potential mothers serves as a rough proxy for the level of childbearing over the preceding few years.