Statistics::calculateEfficiency

static function calculateEfficiency($counters, $maxEfficiency = null)
{
	$efficiency = self::div('CLICK', 'READ', $counters);
	if (!$maxEfficiency)
	{
		$maxEfficiency = self::AVERAGE_EFFICIENCY * 2;
	}
	$efficiency = $efficiency > $maxEfficiency ? $maxEfficiency : $efficiency;
	return self::getCounterCalculation('EFFICIENCY', $efficiency, $maxEfficiency);
}