Posterior variance for quadratic natural exponential families
โ Scribed by Denys Pommeret
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 93 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0167-7152
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โฆ Synopsis
Within the framework of the quadratic natural exponential families we construct a basis of polynomials orthogonal with respect to the posterior density. This construction is adapted from Walter and Hamedani (Ann. Statist. 3 (1991) 1191) and we exploit them to establish lower bounds for the posterior variance.
๐ SIMILAR VOLUMES
A generalization to N" of a property of natural exponential families on ~ with simple quadratic variances is obtained. This property yields the original density in terms of the Laplace transform of the conjugate prior for the natural parameter.
We give a characterization of the natural exponential family with quadratic variance function in terms of a discrete-time reverse martingale-like property. The proof of this result is based on the properties of the set of UMVU estimable functions.
We study consistency and asymptotic normality of posterior distributions of the natural parameter for an exponential family when the dimension of the parameter grows with the sample size. Under certain growth restrictions on the dimension, we show that the posterior distributions concentrate in neig