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Inverse Empirical Cumulative Distribution

 3 years ago
source link: https://yihui.org/cn/2008/09/inverse-empirical-cumulative-distribution/
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Inverse Empirical Cumulative Distribution

谢益辉 / 2008-09-26


这个好玩。今天有一个 JP 摩根的人在 R-help 里问了个问题,题目很吓人,说 R 里面有没有可以求 Inverse 经验分布的函数。我初一看吓坏了,这是啥函数啊,赶紧拿笔在纸上画了一下经验分布函数,然后把它 Inverse 过来,最后想,这不就是分位数函数么!

这不就是分位数函数么!这不就是分位数函数么!这不就是分位数函数么!……

另:Peter Dalgaard 比较严谨,告诉人家要用 quantile () 中的第 7 类求法。我颠颠儿去看了一下帮助,不看不知道,一看吓一跳,分位数的求法一共有 9 种!分位数的求法一共有 9 种! 分位数的求法一共有 9 种!……

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