PHP Manual
Statistic 函数
Returns the variance

stats_variance

(PECL stats >= 1.0.0)

stats_variance — Returns the variance

说明

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

Returns the variance of the values in a.

参数

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.

返回值

Returns the variance on success; FALSE on failure.

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