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In statistics, the quartile coefficient of dispersion is a descriptive statistic which measures dispersion and which is used to make comparisons within and between data sets. The statistic is easily computed using the first (''Q''1) and third (''Q''3) quartiles for each data set. The quartile coefficient of dispersion is: : == Example == Consider the following two data sets: : ''A'' = :: ''n'' = 7, range = 12, mean = 8, median = 8, ''Q''1 = 4, ''Q''3 = 12, coefficient of dispersion = 0.5 : ''B'' = :: ''n'' = 7, range = 1.2, mean = 2.4, median = 2.4, ''Q''1 = 2, ''Q''3 = 2.9, coefficient of dispersion = 0.18 The quartile coefficient of dispersion of data set ''A'' is 2.7 times as great (0.5 / 0.18) as that of data set ''B''. ==See also== * Coefficient of variation 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quartile coefficient of dispersion」の詳細全文を読む スポンサード リンク
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