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                ## 統計 > 選擇統計方法。 ### 關聯 在統計學中使用相關系數來測量兩個變量之間關系的強度。有幾種類型的相關系數。 ### 皮爾遜相關 `Pearson`相關性或`Pearson`相關性是線性回歸中常用的相關系數。 ***** ### 例 ``` use Phpml\Math\Statistic\Correlation; $x = [43, 21, 25, 42, 57, 59]; $y = [99, 65, 79, 75, 87, 82]; Correlation::pearson($x, $y); // return 0.549 ``` ***** ### 平均值 #### 邏輯單元 ### 例 ``` use Phpml\Math\Statistic\Mean; Mean::arithmetic([2, 5]; // return 3.5 Mean::arithmetic([0.5, 0.5, 1.5, 2.5, 3.5]; // return 1.7 ``` ***** ### 中位數 ### 例 ``` use Phpml\Math\Statistic\Mean; Mean::median([5, 2, 6, 1, 3, 4]); // return 3.5 Mean::median([5, 2, 6, 1, 3]); // return 3 ``` ***** ### 模式 ``` use Phpml\Math\Statistic\Mean; Mean::mode([5, 2, 6, 1, 3, 4, 6, 6, 5]); // return 6 ``` ***** ### 標準偏差 ``` use Phpml\Math\Statistic\StandardDeviation; $population = [5, 6, 8, 9]; StandardDeviation::population($population) // return 1.825 $population = [7100, 15500, 4400, 4400, 5900, 4600, 8800, 2000, 2750, 2550, 960, 1025]; StandardDeviation::population($population) // return 4079 ```
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