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59 lines
1.7 KiB
PHP
59 lines
1.7 KiB
PHP
<?php
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/**
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* Orange Management
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*
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* PHP Version 7.4
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*
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* @package tests
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* @copyright Dennis Eichhorn
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* @license OMS License 1.0
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* @version 1.0.0
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* @link https://orange-management.org
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*/
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declare(strict_types=1);
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namespace phpOMS\tests\Math\Stochastic\Distribution;
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use phpOMS\Math\Stochastic\Distribution\BetaDistribution;
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/**
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* @internal
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*/
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class BetaDistributionTest extends \PHPUnit\Framework\TestCase
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{
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public function testMean() : void
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{
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self::assertEquals(1 / 2, BetaDistribution::getMean(2.0, 2.0));
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}
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public function testMode() : void
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{
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self::assertEquals(1 / 2, BetaDistribution::getMode(2.0, 2.0));
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self::assertEqualsWithDelta(0.2, BetaDistribution::getMode(2.0, 5.0), 0.1);
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self::assertEquals(0.0, BetaDistribution::getMode(1.0, 2.0));
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self::assertEquals(1.0, BetaDistribution::getMode(1.0, 1.0));
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}
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public function testVariance() : void
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{
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self::assertEqualsWithDelta(1 / 20, BetaDistribution::getVariance(2.0, 2.0), 0.001);
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}
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public function testStandardDeviation() : void
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{
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self::assertEqualsWithDelta(\sqrt(1 / 20), BetaDistribution::getStandardDeviation(2.0, 2.0), 0.001);
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}
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public function testSkewness() : void
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{
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self::assertEqualsWithDelta(0, BetaDistribution::getSkewness(2.0, 2.0), 0.001);
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self::assertEqualsWithDelta(0.565685, BetaDistribution::getSkewness(1.0, 2.0), 0.001);
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self::assertEqualsWithDelta(-0.565685, BetaDistribution::getSkewness(2.0, 1.0), 0.001);
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}
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public function testExKurtosis() : void
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{
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self::assertEqualsWithDelta(-6 / 7, BetaDistribution::getExKurtosis(2.0, 2.0), 0.001);
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}
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}
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