机构地区: 华南师范大学
出 处: 《华南师范大学学报(自然科学版)》 1997年第4期27-29,共3页
摘 要: 考虑方差分量模型(Y,Xβ,ti=1σ2iVi),假设Xβ的G-M估计存在.本文给出了可观测的随机向量Y的线性变换F为保G-M估计的变换(即存在FY的线性函数为Xβ的G-M估计)的充要条件,并指出在变换前后的模型中,Xβ的G-M估计相同. Under a general variance components model {Y,Xβ,ti=1σ2iVi},a necessary and sufficient condition is established for a linear transformation,F,of the observable random vector Y to have the property that there exists a linear function of FY which is a G-M estimator of Xβ. A method for deriving a required G-M estimator from the transformed model {FY,FXβ,ti=1σ2iFViF′} is also indicated. These results are obtained under the condition of existence of G-M estimator for Xβ.