And it is proved that it has minimum variance of sum and multiplication of variance.The minimax property of variance in the sense of orthogonal unchanged norm is studied.

 
  • 并討論了它的方差在正交不變范數意義下的最小性和方差的最小最大性質(zhì),得出了方差陣的行列式及正交范數在降維估計類(lèi)中最小。
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