note 111685 added to function.stats-covariance
| From: | kanniprabu at gmail dot com | Date: | Sat, 16 Mar 2013 10:30:12 +0000 |
| Subject: | note 111685 added to function.stats-covariance | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-194094@lists.php.net to get a copy of this message | ||
<?php
//Covariance Calculation
function standard_covariance($aValues,$bValues)
{
$a= (array_sum($aValues)*array_sum($bValues))/count($aValues);
$ret = array();
for($i=0;$i<count($aValues);$i++)
{
$ret[$i]=$aValues[$i]*$bValues[$i];
}
$b=(array_sum($ret)-$a)/(count($aValues)-1);
return (float) $b;
}
$aValues=array(3,4,5,7);
$bValues=array(10,11,13,14);
echo standard_covariance($aValues,$bValues);
?>
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Manual Page -- http://php.net/manual/en/function.stats-covariance.php
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