lilyyung 发表于 2017-4-24 08:14 
发现偏偏泊松分布概率密度函数没有
stata 手册D节,252页
poissonp(m,k)
Domain m: 1e–10 to 1e+8
Domain k: 0 to 1e+9
Range: 0 to 1
Description: returns the probability of observing floor(k) outcomes that are distributed as
Poisson with mean m.
The Poisson probability function is evaluated using the gammaden() function.