note 66447 deleted from function.stats-standard-deviation by danbrown

Note Submitter: mightymrj at hotmail dot com ---- Here's a couple functions I made that easily calculate the standard deviation. function average($array){ $sum = array_sum($array); $count = count($array); return $sum/$count; } //The average function can be use independantly but the deviation function uses the average function. function deviation ($array){ $avg = average($array); foreach ($array as $value) { $variance[] = pow($value-$avg, 2); } $deviation = sqrt(average($variance)); return $deviation; } I hope this is useful