作者Alexband (静静的)
看板Statistics
标题[问题]两题数理统计的问题
时间Mon Oct 29 23:43:40 2007
我有两题数理统计的问题不会
想请教板上的各位...希望会的人 能不吝指教...谢谢!!
(1) Give an example in which the best linear predictor of Y given Zis a
constant(has no predictive value) whereas the best predictor of Y given
Z predicts Y perfectly .
(2) Give an example in which Z can be used to predict Y perfectly , but Y
is of no value in predicting Z in the sense that Var(Z|Y) = Var(Z) .
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