看完之后如何不按平均评分排序 http://www.evanmiller.org/how-not-to-sort-by-average-rating.html，我很好奇是否有人有伯努利参数的威尔逊得分置信区间下限的 Python 实现？
Reddit使用Wilson分数区间进行评论排名，可以找到解释和python实现here https://medium.com/hacking-and-gonzo/how-reddit-ranking-algorithms-work-ef111e33d0d9
#Rewritten code from /r2/r2/lib/db/_sorts.pyx
from math import sqrt
def confidence(ups, downs):
n = ups + downs
if n == 0:
return 0
z = 1.0 #1.44 = 85%, 1.96 = 95%
phat = float(ups) / n
return ((phat + z*z/(2*n) - z * sqrt((phat*(1-phat)+z*z/(4*n))/n))/(1+z*z/n))
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