stats_standard_deviation
Returns the standard deviation
説明
float stats_standard_deviation(array $a, bool $sample = false)
パラメータ
-
a
-
The array of data to find the standard deviation for. Note that all
values of the array will be cast to float.
-
sample
-
Indicates if a represents a sample of the
population; defaults to false.
戻り値
Returns the standard deviation on success; false on failure.
エラー / 例外
Raises an E_WARNING when there are fewer than 2
values in a.