PROBABILITY MODEL CHOICE IN SINGLE SAMPLES FROM EXPONENTIAL-FAMILIES USING POISSON LOG-LINEAR MODELING, AND MODEL COMPARISON USING BAYES AND POSTERIOR BAYES FACTORS

This paper describes a method due to Lindsey (1974a) for fitting different exponential family distributions for a single population to the same data, using Poisson log-linear modelling of the density or mass function. The method is extended to Efron's (1986) double exponential family, giving exact ML estimation of the two parameters not easily achievable directly. The problem of comparing the fit of the non-nested models is addressed by both Bayes and posterior Bayes factors (Aitkin, 1991). The latter allow direct comparisons of deviances from the fitted distributions.