[問題] 想請教一題有關負二項分配的問題
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.
這答案我想應該不是零吧@@"，不過我想不太出來說，有人可以幫我解說一下嗎
謝謝啦
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.120.221.74
討論串 (同標題文章)
完整討論串 (本文為第 1 之 2 篇)：