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| 1 | <?php |
| 2 | /** |
| 3 | * Jingga |
| 4 | * |
| 5 | * PHP Version 8.1 |
| 6 | * |
| 7 | * @package phpOMS\Business\Sales |
| 8 | * @copyright Dennis Eichhorn |
| 9 | * @license OMS License 2.0 |
| 10 | * @version 1.0.0 |
| 11 | * @link https://jingga.app |
| 12 | */ |
| 13 | declare(strict_types=1); |
| 14 | |
| 15 | namespace phpOMS\Business\Sales; |
| 16 | |
| 17 | /** |
| 18 | * Market share calculations (Zipf function) |
| 19 | * |
| 20 | * This class can be used to calculate the market share based on a rank or vice versa |
| 21 | * the rank based on a marketshare in a Zipf distributed market. |
| 22 | * |
| 23 | * @package phpOMS\Business\Sales |
| 24 | * @license OMS License 2.0 |
| 25 | * @link https://jingga.app |
| 26 | * @since 1.0.0 |
| 27 | */ |
| 28 | final class MarketShareEstimation |
| 29 | { |
| 30 | /** |
| 31 | * Constructor |
| 32 | * |
| 33 | * @since 1.0.0 |
| 34 | * @codeCoverageIgnore |
| 35 | */ |
| 36 | private function __construct() |
| 37 | { |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Calculate rank (r) based on market share (m) |
| 42 | * |
| 43 | * @latex r = \sqrt[s]{\frac{1}{m \times \sum_{n=1}^N{\frac{1}{n^{s}}}}} |
| 44 | * |
| 45 | * @param int $participants The amount of existing participants in the market or compentitors (N) |
| 46 | * @param float $marketShare The absolute own market share (m) |
| 47 | * @param float $modifier Distribution modifier (s) |
| 48 | * |
| 49 | * @return int Returns the rank |
| 50 | * |
| 51 | * @since 1.0.0 |
| 52 | */ |
| 53 | public static function getRankFromMarketShare(int $participants, float $marketShare, float $modifier = 1.0) : int |
| 54 | { |
| 55 | $sum = 0.0; |
| 56 | for ($i = 0; $i < $participants; ++$i) { |
| 57 | $sum += 1 / \pow($i + 1, $modifier); |
| 58 | } |
| 59 | |
| 60 | return (int) \round(\pow(1 / ($marketShare * $sum), 1 / $modifier)); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Calculate market share (m) based on rank (r) |
| 65 | * |
| 66 | * @latex m = \frac{\frac{1}{r^{s}}}{\sum_{n=1}^N{\frac{1}{n^{s}}}} |
| 67 | * |
| 68 | * @param int $participants The amount of existing participants in the market or compentitors (N) |
| 69 | * @param int $rank The absolute own rank in the market (r) |
| 70 | * @param float $modifier Distribution modifier (s) |
| 71 | * |
| 72 | * @return float Returns the Market share |
| 73 | * |
| 74 | * @since 1.0.0 |
| 75 | */ |
| 76 | public static function getMarketShareFromRank(int $participants, int $rank, float $modifier = 1.0) : float |
| 77 | { |
| 78 | $sum = 0.0; |
| 79 | for ($i = 0; $i < $participants; ++$i) { |
| 80 | $sum += 1 / \pow($i + 1, $modifier); |
| 81 | } |
| 82 | |
| 83 | return (1 / \pow($rank, $modifier)) / $sum; |
| 84 | } |
| 85 | } |