vector quantity
4.Under the vector loss function,the paper discusses the admissibility of the mean paiameter in the special model (H)EY=XβCovY=Xdiag(β_1,β_2,…,β_n)X′ the admissibility of homogeneous linear estimators in L_1={LY∶L is the k×n matrix of the element not defeated by},and nonhomogeneous linear estimators in L_2={LY+C:L is the k×n matrix of the element not defeated by,C is k links the strict row vector quantity not defeated by of element}. It gets several necessary and sufficient conditions.

