A Note on Priors for the Multinomial Model

Frank Tuyl

The American Statistician, 2017, vol. 71, issue 4, 298-301

Abstract: An “overall objective” prior proposed for the multinomial model is shown to be inadequate in the presence of zero counts. An earlier proposed reference prior for when interest is in a particular category suffers from similar problems. It is argued that there is no need to deviate from the uniform prior proposed by Jeffreys, for which links with a non-Bayesian approach, when prediction is of interest, are shown.

Date: 2017
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DOI: 10.1080/00031305.2016.1222309

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