Intermediate fertility variables and marital fertility rates

Summary

Using relatively simple mathematical techniques, an analysis is made of a comprehensive reproductive model that describes the relationships between a set of intermediate fertility variables and the marital fertility rate. Two types of intermediate fertility variables are distinguished: (1) biological parameters and (2) control variables. A homogeneous model is outlined first. Next, this version is extended to include heterogeneity with respect to fecundability and coital rates. Tests of the model with data from two historical populations (i.e. Crulai, 1674–1742, and Tourouvre au Perche, 1665–1765) demonstrate that the model is, indeed, consistent with observed reproductive behaviour in actual populations.