作者JuliaPicard (瓦倫西亞)
站內Statistics
標題[問題] 請問一題幾何分配的問題
時間Tue Sep 19 10:43:27 2006
Let X be a geometrically distributed random variable and let M > 0
be an integer.
Set Z = min(X,M) . Compute the mean of Z.
Set Y = Max(X,M) . Compute the mean of Y.
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1F：推 heysimon:順序統計量... 09/19 13:35
2F：推 qqwerty:f(x)=p(1-p)^x, where x=1,2,...,M-1,M,M+1,... 09/19 21:32
3F：→ qqwerty:sorry, x=0,1,...,M-1,M,M+1,..., 09/19 21:33
4F：→ qqwerty:EZ=0*P(X=0)+1*P(X=1)+...+M*P(X=M)+MP(X=M+1)+... 09/19 21:36
5F：→ qqwerty:EY=M*P(X=0)+M*P(X=1)+...+M*P(X=M)+(M+1)P(X=M+1)+... 09/19 21:38
6F：→ qqwerty:我的想法,給你做個參考... 09/19 21:39
7F：推 JuliaPicard:謝謝大家！^^" 09/20 10:29