作者JuliaPicard (瓦伦西亚)
站内Statistics
标题[问题] 请问一题几何分配的问题
时间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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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 163.14.83.160
1F：推 heysimon:顺序统计量... 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,给你做个参考... 09/19 21:39
7F：推 JuliaPicard:谢谢大家！^^" 09/20 10:29