Code Coverage for /var/www/html/dev/src/phpOMS/Business/Finance/Lorenzkurve.php

1	<?php
2	/**
3	* Jingga
4	*
5	* PHP Version 8.1
6	*
7	* @package phpOMS\Business\Finance
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\Finance;
16
17	/**
18	* Finance class.
19	*
20	* @package phpOMS\Business\Finance
21	* @license OMS License 2.0
22	* @link https://jingga.app
23	* @since 1.0.0
24	*/
25	final class Lorenzkurve
26	{
27	/**
28	* Constructor
29	*
30	* @since 1.0.0
31	* @codeCoverageIgnore
32	*/
33	private function __construct()
34	{
35	}
36
37	/**
38	* Calculate Gini coefficient
39	*
40	* @param array<int\|float> $data Datapoints (can be unsorted)
41	*
42	* @return float Returns the gini coefficient
43	*
44	* @since 1.0.0
45	*/
46	public static function getGiniCoefficient(array $data) : float
47	{
48	$sum1 = 0;
49	$sum2 = 0;
50	$i = 1;
51	$n = \count($data);
52
53	\sort($data);
54
55	foreach ($data as $key => $value) {
56	$sum1 += $i * $value;
57	$sum2 += $value;
58	++$i;
59	}
60
61	return 2 * $sum1 / ($n * $sum2) - ($n + 1) / $n;
62	}
63	}