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xie186 / stat_note_with_r

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https://xie186.github.io/stat_note_with_r/
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Negative_binomial_distribution #3

Open xie186 opened 5 years ago

xie186 commented 5 years ago

概率质量函数为：

image

从负二项分布的概率质量函数可以看出，其概率分布依赖参数p和r。负二项分布的期望值和方差为： image image

Reference: https://mp.weixin.qq.com/s/QBkL8_cW6Lsm5U56SUmUoQ