[機統] 條件期望值
E{u(x-B_1 (Y_1)|x>Y_1>r)} >= E{u(x-Y_2 )|x>Y_1>r}如何推導得到
E[B_1 (Y_1)] >= E[Y_2 ]
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http://www.wretch.cc/album/show.php?i=mp11012&b=18&f=1824872839&p=20
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