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Abstract The purpose of this paper is to investigate some characteristics of rates of conception in a mixed or heterogeneous population. Consider that one has data showing, for a sample of couples, the number of women conceiving in each consecutive month of observation. These data on the monthly incidence of conception may be used to characterize the fecundability (monthly chance of conception) of the couples or to estimate the effectiveness of a contraceptive method in use by them. The data may also be regarded as showing the distribution of the interval to conception. This interval constitutes one component of the interval between successive births and hence is a subject of interest in the study of fertility.
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Mindel C. Sheps (1964) studied this question.
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