Abstract
As an extension of recent results in generalized stable population theory, in this paper a new method for estimating age-specific transition rates for population sub-groups is developed, based on data from two successive demographic surveys. Simple modifications allow the method to work when the data are tabulated in irregular age groups and when the surveys are taken at irregular intervals. A test of the method based on detailed data on smoking behaviour from the 1976 and 1981 censuses of New Zealand shows that the method works well, even when the data are aggregated into a small number of irregular age groups.

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