Returns the standard deviation

# stats_standard_deviation

(PECL stats >= 1.0.0)

stats_standard_deviation — Returns 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`.

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