Python实现了威尔逊的评分区间？ [英] Python implementation of the Wilson Score Interval?

问题描述

阅读如何不至按平均评分后，我很好奇，如果任何人有一个Python实现一个较低的约束威尔逊的得分置信区间伯努利参数？

After reading How Not to Sort by Average Rating, I was curious if anyone has a Python implementation of a Lower bound of Wilson score confidence interval for a Bernoulli parameter?

推荐答案

reddit的使用威尔逊评分区间征求意见的排名，解释和Python实现，可以发现的这里

Reddit uses the Wilson score interval for comment ranking, an explanation and python implementation can be found here

#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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