Asymptotic Expansions of Posterior Distributions in Nonregular Cases

Authors: Ghosal S.¹; Samanta T.²

Source: Annals of the Institute of Statistical Mathematics, Volume 49, Number 1, March 1997 , pp. 181-197(17)

Publisher: Springer

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Abstract:

We study the asymptotic behaviour of the posterior distributions for a one-parameter family of discontinuous densities. It is shown that a suitably centered and normalized posterior converges almost surely to an exponential limit in the total variation norm. Further, asymptotic expansions for the density, distribution function, moments and quantiles of the posterior are also obtained. It is to be noted that, in view of the results of Ghosh et al. (1994, Statistical Decision Theory and Related Topics V, 183-199, Springer, New York) and Ghosal et al. (1995, Ann. Statist., 23, 2145-2152), the nonregular cases considered here are essentially the only ones for which the posterior distributions converge. The results obtained here are also supported by a simulation experiment.

Keywords: Asymptotic expansion; posterior distributions; non-regular cases

Language: English

Document Type: Regular paper

Affiliations: 1: Division of Theoretical Statistics and Mathematics, Indian Statistical Institute, 203 B.T. Road, Calcutta-700035, India 2: Computer Science Unit, Indian Statistical Institute, 203 B.T. Road, Calcutta-700035, India

Publication date: 1997-03-01