作者adofly (风)
看板Statistics
标题[问题] 想请教一题有关负二项分配的问题
时间Tue Dec 19 21:29:27 2006
If X is distributed from a negative binomial distribution with an
integer-valued parameter r and 0 < p < 1 , which is denoted by NBD(r,p)
for short. Assume that X1 and X2 have the same distribution as X
and X1 + X2 come from NBD(r,P*), where p* = p/(2-p). Evaluate the
covariance of X1 and X2.
这答案我想应该不是零吧@@"，不过我想不太出来说，有人可以帮我解说一下吗
谢谢啦
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