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Bayes Convolution

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  • Edwin R. van den Heuvel
  • Chris A. J. Klaassen

Abstract

A general convolution theorem within a Bayesian framework is presented. Consider estimation of the Euclidean parameter θ by an estimator T within a parametric model. Let W be a prior distribution for θ and define G as the W‐average of the distribution of T ‐ θ under θ. In some cases, for any estimator T the distribution G can be written as a convolution G = K * L with K a distribution depending only on the model, i.e. on W and the distributions under θ of the observations. In such a Bayes convolution result optimal estimators exist, satisfying G = K. For location models we show that finite sample Bayes convolution results hold in the normal, loggamma and exponential case. Under regularity conditions we prove that normal and loggamma are the only smooth location cases. We also discuss relations with classical convolution theorems. Nous considérons l'estimation d'un paramètre euclidien θ par un estimateur T dans un modèle paramétrique. Soit W une distribution a priori pour θ et definirons Gpar la W‐moyenne de la distribution de T‐θ sous θ. II ya des situations dans lesquelles la distribution G est une convolution G = K•L pour tout estimateur T,où K est une distribution qui dépend seulement du modèle, c‐à‐d de W et des distributions sous θ des observations.En cas de ce resultat de convolution bayésiennem des estimaturs optimaux existent qui satisfont à G = K. Pour des modéles de location nous prouvons, qu'il y a des résultats de convolution bayésienne àéchantillons finis dans les casnormaux, log‐gamma et exponentiels. Sous des conditions de régularité nous prouvons. que les seules situations polies de location sont des normales et log‐gamma. Nous discutons aussi des relations avec les théorèmes classiques de convolution.

Suggested Citation

  • Edwin R. van den Heuvel & Chris A. J. Klaassen, 1999. "Bayes Convolution," International Statistical Review, International Statistical Institute, vol. 67(3), pages 287-299, December.
  • Handle: RePEc:bla:istatr:v:67:y:1999:i:3:p:287-299
    DOI: 10.1111/j.1751-5823.1999.tb00450.x
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