Code Coverage for /var/www/html/dev/src/phpOMS/Math/Statistic/Forecast/Regression/MultipleLinearRegression.php

1	<?php
2	/**
3	* Jingga
4	*
5	* PHP Version 8.1
6	*
7	* @package TBD
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\Math\Statistic\Forecast\Regression;
16
17	use phpOMS\Math\Matrix\Matrix;
18
19	/**
20	* Regression class.
21	*
22	* @package phpOMS\Math\Statistic\Forecast\Regression
23	* @license OMS License 2.0
24	* @link https://jingga.app
25	* @since 1.0.0
26	*/
27	final class MultipleLinearRegression extends RegressionAbstract
28	{
29	/**
30	* Get linear regression based on scatter plot.
31	*
32	* @latex y = b_{0} + b_{1} \cdot x
33	*
34	* @param array<array<int\|float>> $x Obersved x values
35	* @param array<array<int\|float>> $y Observed y values
36	*
37	* @return array [b0 => ?, b1 => ?]
38	*
39	* @since 1.0.0
40	*/
41	public static function getRegression(array $x, array $y) : array
42	{
43	$X = new Matrix(\count($x), \count($x[0]));
44	$X->setMatrix($x);
45	$XT = $X->transpose();
46
47	$Y = new Matrix(\count($y));
48	$Y->setMatrix($y);
49
50	return $XT->mult($X)->inverse()->mult($XT)->mult($Y)->getMatrix();
51	}
52
53	/**
54	* {@inheritdoc}
55	*/
56	public static function getSlope(float $b1, float $y, float $x) : float
57	{
58	return 0.0;
59	}
60
61	/**
62	* {@inheritdoc}
63	*/
64	public static function getElasticity(float $b1, float $y, float $x) : float
65	{
66	return 0.0;
67	}
68	}