Wednesday, August 02, 2006

Measuring Fertility

CFR and TFR in Sweden

This post is related to both the one which comes before it and the one which follows. CFR refers to cohort fertility rate and TFR to total fertility rate.

Fertility can be measured in a number of ways, and two of the most important of these are the total fertility rate and the cohort fertility rate. The total fertility rate (TFR) is an estimate of periodic fertility and is defined as the sum of number of children born by women in a defined age range (16-49) extrapolated to the lifetime fertility of the total number of women in that age group. The cohort fertility rate (CFR) is the average number of children which women actually give birth to during their lifetime fertility cycle, and is only known when the women in the cohort end their fertile life. CFR is an accurate and important indicator since it measures whether the completed fertility for women achieves replacement level or not. The replacement level is the number of children per woman (approximately 2.1) needed in order to hold the population constant.
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