השוואת שיטות

	Tempo-Adjusted Fertility	Total Fertility Rate
תחום	דמוגרפיה	דמוגרפיה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1998	2001
הוגה השיטה	John Bongaarts & Griffith Feeney	Classical demographic index (formalized by Preston, Heuveline & Guillot)
סוג	Tempo-and-quantum adjustment of the period total fertility rate	Period summary fertility index synthesizing age-specific fertility rates
מקור מכונן	Bongaarts, J., & Feeney, G. (1998). On the quantum and tempo of fertility. Population and Development Review, 24(2), 271–291.	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512
כינויים	Bongaarts-Feeney adjustment, Tempo-adjusted TFR, Quantum-tempo decomposition of fertility, Tempo Düzeltmeli Doğurganlık	TFR, Period total fertility rate, Sum of age-specific fertility rates, Toplam Doğurganlık Hızı
קשורות	4	4
תקציר	Tempo-adjusted fertility is the Bongaarts-Feeney correction of the period total fertility rate that removes the distortion introduced when the timing of childbearing changes. When women collectively postpone (or advance) births, the conventional period total fertility rate is artificially depressed (or inflated) even if the number of children women ultimately have is unchanged; the adjustment inflates each birth-order-specific rate by a factor based on the changing mean age at childbearing to recover an undistorted measure of fertility quantum.	The total fertility rate (TFR) is the central period measure of fertility in demography: the average number of children a woman would bear over her lifetime if she experienced, at each age, the age-specific fertility rates observed in a given year. Computed by summing age-specific fertility rates across the reproductive ages, the TFR removes the influence of population age structure and gives a single, intuitive figure — children per woman — that is comparable across populations and over time.