差分

[[統計]] | [[R]] |

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*https://www.slideshare.net/itoyan110/ss-69491897

===組み合わせの数===

*https://mathwords.net/combination

>>> import math

>>> cmb(10,2)

45.0

>choose(10, 2)

[1] 45

*https://bellcurve.jp/statistics/course/6979.html

*コインを10回投げて表が3回出る確率

*cmb は、組み合わせの数で定義

>>> dbinom = lambda k,n,p:cmb(n,k) * math.pow(p,k) * math.pow((1-p),(n-k))

>>> dbinom(3,10,0.5)

0.1171875

> dbinom(3,10,0.5)

[1] 0.1171875

*https://mathwords.net/ruisekibunpu

>>> pbinom = lambda q,n,p:sum([dbinom(k,n,p) for k in range(0,q+1)])

>>> pbinom(3,10,0.5)

0.171875

> pbinom(3,10,0.5)

[1] 0.171875