四分位距 (InterQuartile Range)
怎麼算四分位距 (IQR)真是個好問題！圖解看起來很簡單～
WiKi如何描述四分位距：
四分位距（interquartile range, IQR）。是描述統計學中的一種方法，以確定第三四分位數和第一四分位數的分別（即 {Ｑ1和Ｑ3的差距）。與變異數、標準差一樣，表示統計資料中各變量分散情形，但四分差更多為一種穩健統計（robust statistic）。
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