Abstract
We consider a one-parameter exponential family generated by an arbitrary group of transformations of an abstract sample space. Topological assumptions about the group are not required. It is shown that such a family has densities either of the type of the normal distribution or of the type of the gamma distribution with respect to an invariant measure. This is a generalization of results of Dynkin (1951), Lindley (1958) and Ferguson (1962 and 1963).
Citation
R. Borges. J. Pfanzagl. "One-Parameter Exponential Families Generated by Transformation Groups." Ann. Math. Statist. 36 (1) 261 - 271, February, 1965. https://doi.org/10.1214/aoms/1177700287
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