stats_standard_deviation

(PECL stats >= 1.0.0)

stats_standard_deviationReturns the standard deviation

Описание

stats_standard_deviation ( array $a , bool $sample = false ) : float

Returns the standard deviation of the values in a.

Список параметров

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.

Возвращаемые значения

Returns the standard deviation on success; false on failure.

Ошибки

Raises an E_WARNING when there are fewer than 2 values in a.