replace mean calls

aa753421 · Apr 27, 2016 · 52cbda0 · 52cbda0
1 parent 80a712e
commit 52cbda0
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/src/Phpml/Math/Statistic/Correlation.php b/src/Phpml/Math/Statistic/Correlation.php
@@ -23,8 +23,8 @@ public static function pearson(array $x, array $y)
         }
 
         $count = count($x);
-        $meanX = array_sum($x) / $count;
-        $meanY = array_sum($y) / $count;
+        $meanX = Mean::arithmetic($x);
+        $meanY = Mean::arithmetic($y);
 
         $axb = 0;
         $a2 = 0;

diff --git a/src/Phpml/Math/Statistic/StandardDeviation.php b/src/Phpml/Math/Statistic/StandardDeviation.php
@@ -28,7 +28,7 @@ public static function population(array $a, $sample = true)
             throw InvalidArgumentException::arraySizeToSmall(2);
         }
 
-        $mean = array_sum($a) / $n;
+        $mean = Mean::arithmetic($a);
         $carry = 0.0;
         foreach ($a as $val) {
             $d = $val - $mean;