Standar Deviation PHP function

SUBMITTED BY: Guest

DATE: Dec. 5, 2013, 3:29 a.m.

FORMAT: PHP

SIZE: 256 Bytes

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function standard_deviation($sample){
	if(is_array($sample)){
		$mean = array_sum($sample) / count($sample);
		foreach($sample as $key => $num) $devs[$key] = pow($num - $mean, 2);
		return sqrt(array_sum($devs) / (count($devs) - 1));
	}
}