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<?php declare(strict_types=1); namespace Phpml\Math\Statistic; use Phpml\Exception\InvalidArgumentException; class Mean { /** * @throws InvalidArgumentException */ public static function arithmetic(array $numbers): float { self::checkArrayLength($numbers); return array_sum($numbers) / count($numbers); } /** * @return float|mixed * * @throws InvalidArgumentException */ public static function median(array $numbers) { self::checkArrayLength($numbers); $count = count($numbers); $middleIndex = (int) floor($count / 2); sort($numbers, SORT_NUMERIC); $median = $numbers[$middleIndex]; if ($count % 2 === 0) { $median = ($median + $numbers[$middleIndex - 1]) / 2; } return $median; } /** * @return mixed * * @throws InvalidArgumentException */ public static function mode(array $numbers) { self::checkArrayLength($numbers); $values = array_count_values($numbers); return array_search(max($values), $values, true); } /** * @throws InvalidArgumentException */ private static function checkArrayLength(array $array): void { if (count($array) === 0) { throw new InvalidArgumentException('The array has zero elements'); } } }
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