MathPHP\Statistics\Average::generalizedMean PHP Метод

    public static function generalizedMean(array $numbers, $p)
    {
        // Special cases for infinite p
        if ($p == -\INF) {
            return min($numbers);
        }
        if ($p == \INF) {
            return max($numbers);
        }
        // Special case for p = 0 (geometric mean)
        if ($p == 0) {
            return self::geometricMean($numbers);
        }
        // Standard case for non-infinite p
        $n = count($numbers);
        $∑xᵢᵖ = array_sum(array_map(function ($x) use($p) {
            return $x ** $p;
        }, $numbers));
        return pow(1 / $n * $∑xᵢᵖ, 1 / $p);
    }