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Tempo and the TFR

Ní Bhrolcháin, Máire (2008) Tempo and the TFR , Southampton, GB Southampton Statistical Sciences Research Institute 45pp. (S3RI Applications & Policy Working Papers, A08/10).

Record type: Monograph (Working Paper)


The paper proposes that whether period indicators are biased by timing effects depends on the objective of measurement. Several kinds of bias in the TFR are identified. Five reasons for measuring period fertility are distinguished: to explain fertility time trends, to anticipate future prospects, to describe trends, to provide input parameters for formal models, and to communicate with non-specialist audiences. Genuine timing effects are not biasing where period fertility is the explanandum, but are distorting where the aim is to estimate cohort fertility. Synthetic measures such as the TFR have a number of known defects. Alternatives to the TFR are available, and seem a more defensible solution to current problems than tempo adjustment. Tempo adjustment could be more fruitfully considered a form of modelling rather than empirical measurement. The measurement of period fertility could benefit by a more statistical approach and less reliance on indicators requiring stable assumptions.

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Published date: 27 August 2008
Keywords: fertility, measurement, period fertility, total fertility rate, tfr, synthetic cohort measures, tempo adjustment, fertility timing, fertility quantum, projection


Local EPrints ID: 65033
PURE UUID: 69c466cd-0c86-482c-84a8-49b9ae69f03d

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Date deposited: 28 Jan 2009
Last modified: 17 Jul 2017 14:10

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Author: Máire Ní Bhrolcháin

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