Satoshi, Kuriki; Takemura, Akimichi - Center for International Research on the Japanese … - 1997
We give James-Stein type estimators of multivariate normal mean vector by shrinkage to closed convex set K with smooth or piecewise smooth boundary. The rate of shrinkage is determined by the curvature of boundary of K at the projection point onto K. By considering a sequence of polytopes Kj...