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標準差 D(X)= E [X - E(X)]2 根號D(X)為X的均方差或標準差 常用公式D(X)=E(X2)-E2(X) 協方差 COV(X,Y)=E([X-E(X)][Y-E(Y)]) 相關係數 協方差/[根號D(X)*根號D(Y)]
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