THREE RANK FORMULAS ASSOCIATED WITH THE COVARIANCE MATRICES OF THE BLUE AND THE OLSE IN THE GENERAL LINEAR MODEL
一般线性模型中 BLUE 与普通最小二乘协方差矩阵的三个秩公式AI 解读 ↓
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In this paper we consider the estimation of the expectation vector X β under the general linear model { y , X β,σ 2 V }. We introduce a new handy representation for the rank of the difference of the covariance matrices of the ordinary least squares estimator OLSE( X β) (= Hy , say) and the best linear unbiased estimator BLUE( X β) (= Gy , say). From this formula some well-known conditions for the equality between Hy and Gy follow at once. We recall that the equality between Hy and Gy can be characterized by the rank-subtractivity ordering between the covariance matrices of y and Hy . This rank characterization suggests a particular presentation for the rank of the difference of the covariance matrices of Hy and Gy . We show, however, that this presentation is valid if and only if the model is connected.