A probability model for number of births and its application in estimation of fecundability for a heterogeneous population.

"Under some simple assumptions relating to the human reproduction process, an extension of a probability model describing the variations in the number of births to a female during a specified period of time (O, T) of length T, is proposed. The model is extended to a situation when the female population consists of two distinct groups with respect to fecundability. A procedure of estimation of some of the underlying parameters is given. The applicability of the model is illustrated with an observed distribution." Data for the illustration are from a population survey undertaken in Varanasi, India, in 1978.