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把全部数据分为四部分的百分位数,称为四分位数,即第1四分位数(P25)、第2四分位数(P50,即中位数M)、第3四分位数(P75)。四分位数间距是由第3四分位数和第1四分位数相减而得,用Q表示,Q=P75-P25。一般用中位数和四分位数间距一起来描述偏态分布资料的分布特征。
Divide all data into quartiles of percentiles, called the quartiles, that is, the first quartile (P25), the second quartile (P50, the median M), the third quartet Quantile (P75). The interquartile range is obtained by subtracting the third quartile from the first quartile, expressed as Q, and Q = P75-P25. The median and quartile spacing are generally used to describe the distribution of skewed distributions.