pnbinom - RとLinuxと...

RとLinuxと...


pnbinom

Rの備忘録

3 回表が出るまでに 9 回以上裏が出る確率

> 1 - pnbinom(8, size=3, prob = .5)
[1] 0.03271484
> pnbinom(8, siz = 3, pro = .5, low = F)
[1] 0.03271484
> sum(dnbinom(9:100, size=3, prob = .5))
[1] 0.03271484

上側の確率が、そのつど重複して加算されている。

> sum(pnbinom(8:10, size=3, prob = .5, lower = F))
[1] 0.06323242

> pnbinom(9, size=3, prob = .5)
[1] 0.9807129
> pnbinom(10, size=3, prob = .5)
[1] 0.9887695
> dnbinom(10, size=3, prob = .5)
[1] 0.00805664
> pnbinom(9, size=3, prob = .5, low =T ) + 
        dnbinom(10, si = 3, pro = .5)
[1] 0.9887695
 
Link: Rの備忘録(1827d)
Last-modified: 2010-01-09 (土) 14:31:46 (3266d)