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Misspecification in Infinite-Dimensional Bayesian Statistics

B. J. K. Kleijn and A. W. van der Vaart
The Annals of Statistics
Vol. 34, No. 2 (Apr., 2006), pp. 837-877
Stable URL: http://www.jstor.org/stable/25463439
Page Count: 41
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Misspecification in Infinite-Dimensional Bayesian Statistics
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Abstract

We consider the asymptotic behavior of posterior distributions if the model is misspecified. Given a prior distribution and a random sample from a distribution P₀, which may not be in the support of the prior, we show that the posterior concentrates its mass near the points in the support of the prior that minimize the Kullback-Leibler divergence with respect to P₀. An entropy condition and a prior-mass condition determine the rate of convergence. The method is applied to several examples, with special interest for infinite-dimensional models. These include Gaussian mixtures, nonparametric regression and parametric models.

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