Please note that this function is reserved for two arrays with continued numbers inside (just integers).
I tested this function and found that it calculate the Pearson's Correlation Coefficient of two arrays.
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Here's suggested documentation:
stats_stat_correlation — Calculate the Pearson's Correlation Coefficient of two arrays of continued numbers.
Parameters:
arr1 = array (integer1a, interger2a ...)
arr2 = array (integer1b, interger2b ...))
(Note that the count of elements in two arrays must be equal)
Return value: Pearson's Correlation Coefficient in decimal format (ex. 0.934399822094)
Code examples:
<?php
$array_x = array(5,3,6,7,4,2,9,5);
$array_y = array(4,3,4,8,3,2,10,5);
$pearson = stats_stat_correlation($array_x,$array_y);
echo $pearson;
?>
