Returns the standard deviation

stats_skew
stats_stat_binomial_coef
Statistic Functions
PHP Manual

# stats_standard_deviation

(PECL stats >= 1.0.0)

stats_standard_deviation — Returns the standard deviation

### Description

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

### 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`.

stats_skew
stats_stat_binomial_coef
Statistic Functions
PHP Manual