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68 lines
1.6 KiB
PHP
68 lines
1.6 KiB
PHP
<?php
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/**
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* Orange Management
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*
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* PHP Version 7.0
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*
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* @category TBD
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* @package TBD
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* @author OMS Development Team <dev@oms.com>
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* @author Dennis Eichhorn <d.eichhorn@oms.com>
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* @copyright 2013 Dennis Eichhorn
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* @license OMS License 1.0
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* @version 1.0.0
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* @link http://orange-management.com
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*/
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namespace phpOMS\Math\Statistic\Forecast\Regression;
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/**
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* Regression class.
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*
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* @category Framework
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* @package phpOMS\DataStorage\Database
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* @author OMS Development Team <dev@oms.com>
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* @author Dennis Eichhorn <d.eichhorn@oms.com>
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* @license OMS License 1.0
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* @link http://orange-management.com
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* @since 1.0.0
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*/
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class LogLevelRegression extends RegressionAbstract
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{
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/**
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* Get linear regression based on scatter plot.
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*
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* y = b0 + b1 * x
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*
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* @param array $x Obersved x values
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* @param array $y Observed y values
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*
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* @return array [b0 => ?, b1 => ?]
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*
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* @since 1.0.0
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* @author Dennis Eichhorn <d.eichhorn@oms.com>
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*/
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public static function getRegression(array $x, array $y) : array
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{
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if (($c = count($x)) != count($y)) {
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throw new \Exception('Dimension');
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}
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for ($i = 0; $i < $c; $i++) {
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$y[$i] = log($y[i]);
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}
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return parent::getRegression($x, $y);
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}
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public static function getSlope(float $b1, float $y, float $x) : float
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{
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return $b1 * $y;
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}
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public static function getElasticity(float $b1, float $y, float $x): float
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{
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return $b1 * $x;
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}
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} |