Volume 13 - Article 9 | Pages 201-222

Tempo and its Tribulations

By Kenneth W. Wachter

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Date received:28 Jan 2005
Date published:11 Nov 2005
Word count:5262
Keywords:demographic translation, life expectancy, standardization, tempo, TFR


Bongaarts and Feeney offer alternatives to period life expectancy with a set of demographic measures equivalent to each other under a Proportionality Assumption. Under this assumption, we show that the measures are given by exponentially weighted moving averages of earlier values of period life expectancy. They are indices of mortality conditions in the recent past. The period life expectancy is an index of current mortality conditions. The difference is a difference between past and present, not a ``tempo distortion'' in the present. In contrast, the Bongaarts-Feeney tempo-adjusted Total Fertility Rate is a measure of current fertility conditions, which can be understood in terms of a process of birth-age standardization.

Author's Affiliation

Kenneth W. Wachter - University of California at Berkeley, United States of America [Email]

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