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

Married Woman Gini Index Contraceptive Practice Gestation Period Geometric Progression
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin · Heidelberg 1977