Mathematical Demography pp 367-371 | Cite as

# First Investigations on the Fecundability of a Woman

Chapter

## Abstract

For the where n

*Gini Index*, Gini’s “approximate measure of the mean fecundability of primipares who had their child in the months of marriage from*x*+ 9 to*x*+*y*+ 9,” we may write$$F_G = \frac{{n_{x + 9} - n_{x + y + 10} }}{{\sum\limits_{x + 9}^{x + y + 9} {n_i } }} = \frac{{n_1 - n_{y + 1} }}{{\sum\limits_1^y {n_i } }},$$

_{ i }are births in the*i*’ th, and*n*_{ i }births in the (*i*+ 9)’th month of exposure. If fecundity differs among women but for each woman is constant over time, the Index has as its limiting value the arithmetic mean fecundability of the non-sterile population*N**. This is seen by noting that as*y*approaches infinity,*n*_{y+1}→0 and \(\sum\limits_1^y {n_i \to N^* }. \)### Keywords

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## Copyright information

© Springer-Verlag Berlin · Heidelberg 1977