Conjugate Location-Dispersion Families

Toshio Ohnishi, Takemi Yanagimoto
2007 Journal of the Japan Statistical Society  
We make a conjugate analysis for the five location-dispersion families including the normal, the transformed gamma and the von Mises distributions. The five families are introduced through the requirement for the existence of conjugate prior densities. We show in a unified way that a Pythagorean relationship holds with respect to posterior risks, which clarifies the optimality of the posterior mode under a Kullback-Leibler loss. An explicit form of the posterior mode is given, and a type of
more » ... , and a type of linearity is observed. We construct an empirical Bayes estimator of a location vector explicitly.
doi:10.14490/jjss.37.307 fatcat:xzh5xt5mzrg2rnos2r2kn6tce4