MathPHP\Statistics\Correlation::R2 PHP Method

R² - coefficient of determination Convenience wrapper for coefficientOfDetermination

public static R2 ( array $X, array $Y, boolean $popluation = false ) : number
$X	array	values for random variable X
$Y	array	values for random variable Y
$popluation	boolean
return	number

    public static function R2(array $X, array $Y, bool $popluation = false)
    {
        return pow(self::r($X, $Y, $popluation), 2);
    }

Correlation