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Create MarketShareEstimation.php

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Dennis Eichhorn 2017-07-13 13:01:30 +02:00 committed by GitHub
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<?php
/**
* Orange Management
*
* PHP Version 7.1
*
* @category TBD
* @package TBD
* @author OMS Development Team <dev@oms.com>
* @author Dennis Eichhorn <d.eichhorn@oms.com>
* @copyright Dennis Eichhorn
* @license OMS License 1.0
* @version 1.0.0
* @link http://orange-management.com
*/
declare(strict_types=1);
namespace phpOMS\Business\Sales;
/**
* Market share calculations
*
* @category Framework
* @package phpOMS\Business
* @author OMS Development Team <dev@oms.com>
* @author Dennis Eichhorn <d.eichhorn@oms.com>
* @license OMS License 1.0
* @link http://orange-management.com
* @since 1.0.0
*/
class MarketShareEstimation {
public static function getRankFromMarketShare(int $participants, float $marketShare, float $modifier = 1.0) : int
{
$sum = 0.0;
for($i = 0; $i < $participants; $i++) {
$sum += 1 / pow($i+1, $modifier);
}
return (int) round(pow(1 / ($marketShare * $sum); 1 / $modifier));
}
public static function getMarketShareFromRank(int $participants, int $rank, float $modifier = 1.0) : float
{
$sum = 0.0;
for($i = 0; $i < $participants; $i++) {
$sum += 1 / pow($i+1, $modifier);
}
return (1 / pow($rank, $modifier)) / $sum;
}
}