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PHP Manual [stats_standard_deviation]

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PHP Manual || Statistic Functions

(PECL stats >= 1.0.0)

stats_standard_deviationReturns the standard deviation

Description

stats_standard_deviation ( array $a [, bool $sample = FALSE ] ) : float

Returns the standard deviation of the values in a.

Parameters

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.

Return Values

Returns the standard deviation on success; FALSE on failure.

Errors/Exceptions

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



PHP Manual || Statistic Functions