四分位距
四分位距（interquartile range, IQR）。是描述统计学中的一种方法，以确定第三四分位数和第一四分位数的分别（即
的差距）。与方差、标准差一样，表示统计数据中各变量分散情形，但四分差更多为一种稳健统计（robust statistic）。
四分位差（Quartile Deviation, QD），是的差距，即
。
Interquartile range
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Interquartile range 四分位距
In descriptive statistics, the interquartile range (IQR), also called the midspread or middle fifty, is a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles, IQR = Q3 − Q1. In other words, the IQR is the 1st quartile subtracted from the 3rd quartile; these quartiles can be clearly seen on a box plot on the data. It is a trimmed estimator, defined as the 25% trimmed range, and is the most significant basic robust measure of scale.
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