MathPHP\Probability\Distribution\Continuous\ChiSquared::CDF PHP Метод

    public static function CDF($x, int $k)
    {
        Support::checkLimits(self::LIMITS, ['x' => $x, 'k' => $k]);
        // Numerator
        $γ⟮k／2、x／2⟯ = Special::γ($k / 2, $x / 2);
        // Demoninator
        $Γ⟮k／2⟯ = Special::Γ($k / 2);
        return $γ⟮k／2、x／2⟯ / $Γ⟮k／2⟯;
    }