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分位数（quantile）是描述一组数据分布的度量，它表示在一个样本中有多少的数小于或等于该数。分位数也可以被称为百分位数（percentile）。分位数的来源可以追溯到19世纪末，当时统计学家Karl Pearson在研究人群身高分布时发
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