1st percentile 分位数的理解 quartile quantile percentile

 

quantile=分位数
quartile=四分位数 percentile=百分位数
纯计算的角度看,三个量的特殊值关系如下

0th quartile = 0th quantile = 0th percentile = min负无穷远点
1st quartile = .25th quantile = 25th percentile = lower quartile下四分位数(中点以下,又取中点)
2nd quartile = .5th quantile = 50th percentile = median中点/中位数
3rd quartile = .75th quantile = 75th percentile = upper quartile上四分位数(中点以上,又取中点)

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