© 2001 by Biometrika Trust
Miscellaneous |
A shrinkage predictive distribution for multivariate Normal observables
1 Department of Mathematical Informatics, Graduate School of Information Science and Technology, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japankomaki{at}stat.t.u-tokyo.ac.jp
We investigate shrinkage methods for constructing predictive distributions.We consider the multivariate Normal model with a known covariance matrix and show that there exists a shrinkage predictive distribution dominating the Bayesian predictive distribution based on the vague prior when the dimension is not less than three. KullbackLeibler divergence from the true distribution to a predictive distribution is adopted as a loss function.
Key Words: Invariance; JamesStein estimator; KullbackLeibler divergence; Stein's prior; Vague prior
Received August 2000. Revised December 2000