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PHP stats_standard_deviation

PHP original manual for stats_standard_deviation [ show | php.net ]

(PECL stats >= 1.0.0)

stats_standard_deviation — Returns the standard deviation

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

Returns the standard deviation of the values in a.

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.

Returns the standard deviation on success; FALSE on failure.

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