41 lines
1.4 KiB
PHP
41 lines
1.4 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Tests\Math\Statistic;
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use Phpml\Exception\InvalidArgumentException;
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use Phpml\Math\Statistic\StandardDeviation;
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use PHPUnit\Framework\TestCase;
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class StandardDeviationTest extends TestCase
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{
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public function testStandardDeviationOfPopulationSample(): void
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{
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//https://pl.wikipedia.org/wiki/Odchylenie_standardowe
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$delta = 0.001;
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$population = [5, 6, 8, 9];
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$this->assertEquals(1.825, StandardDeviation::population($population), '', $delta);
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//http://www.stat.wmich.edu/s216/book/node126.html
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$delta = 0.5;
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$population = [7100, 15500, 4400, 4400, 5900, 4600, 8800, 2000, 2750, 2550, 960, 1025];
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$this->assertEquals(4079, StandardDeviation::population($population), '', $delta);
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$population = [9300, 10565, 15000, 15000, 17764, 57000, 65940, 73676, 77006, 93739, 146088, 153260];
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$this->assertEquals(50989, StandardDeviation::population($population), '', $delta);
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}
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public function testThrowExceptionOnEmptyArrayIfNotSample(): void
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{
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$this->expectException(InvalidArgumentException::class);
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StandardDeviation::population([], false);
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}
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public function testThrowExceptionOnToSmallArray(): void
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{
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$this->expectException(InvalidArgumentException::class);
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StandardDeviation::population([1]);
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}
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}
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