On standard conjugate families for natural exponential families with bounded natural parameter space.

Hornik, Kurt ORCID: https://orcid.org/0000-0003-4198-9911 and Grün, Bettina (2014) On standard conjugate families for natural exponential families with bounded natural parameter space. Journal of Multivariate Analysis, 126. pp. 14-24. ISSN 0047-259X

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Diaconis and Ylvisaker (1979) give necessary conditions for conjugate priors for distributions from the natural exponential family to be proper as well as to have the property of linear posterior expectation of the mean parameter of the family. Their conditions for propriety and linear posterior expectation are also sufficient if the natural parameter space is equal to the set of all d-dimensional real numbers. In this paper their results are extended to characterize when conjugate priors are proper if the natural parameter space is bounded. For the special case where the natural exponential family is through a spherical probability distribution n,we show that the proper conjugate priors can be characterized by the behavior of the moment generating function of n at the boundary of the natural parameter space, or the second-order tail behavior of n. In addition, we show that if these families are non-regular, then linear posterior expectation never holds. The results for this special case are also extended to natural exponential families through elliptical probability distributions.

Item Type: Article
Additional Information: This research was funded by the Austrian Science Fund (FWF): V170-N18.
Keywords: Bayesian analysis, Conjugate prior, Elliptical distribution, Exponential family, Linear posterior expectation, Spherical distribution
Classification Codes: AMS: 62E10 62F15 62H11
Divisions: Departments > Finance, Accounting and Statistics > Statistics and Mathematics
Forschungsinstitute > Rechenintensive Methoden
Version of the Document: Published
Depositing User: Gertraud Novotny
Date Deposited: 06 Mar 2017 14:00
Last Modified: 19 Jul 2020 11:54
Related URLs:
FIDES Link: https://bach.wu.ac.at/d/research/results/84798/
URI: https://epub.wu.ac.at/id/eprint/5451


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