note 99792 added to function.stats-standard-deviation
| From: | PascalWoerde at osu1 dot php dot net | Date: | Tue, 07 Sep 2010 07:04:21 +0000 |
| Subject: | note 99792 added to function.stats-standard-deviation | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-172353@lists.php.net to get a copy of this message | ||
If you want one function for the population and sample, you can use this function:
<?php
function standard_deviation($aValues, $bSample = false)
{
$fMean = array_sum($aValues) / count($aValues);
$fVariance = 0.0;
foreach ($aValues as $i)
{
$fVariance += pow($i - $fMean, 2);
}
$fVariance /= ( $bSample ? count($aValues) - 1 : count($aValues) );
return (float) sqrt($fVariance);
}
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Server IP: 91.199.167.223
Probable Submitter: 92.65.201.11
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Manual Page -- http://www.php.net/manual/en/function.stats-standard-deviation.php
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