Let (X,Y) be a R~d×R~ valued random vector and (X_,Y_), (X_,Y_) …(X_n,Y_n) be a random sample drawn from (X,Y).
Let (X,Y) be a R~d×R~ valued random vector and (X_,Y_), (X_,Y_) …(X_n,Y_n) be a random sample drawn from (X,Y).
设(X_,Y_),(X_,Y_),…(X_n,Y_n)为从取值于R~d×R~的总体(X,Y)中抽出的一个随机样本。