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https://github.com/Llewellynvdm/php-ml.git
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3ba35918a3
* Add sum of squares deviations * Calculate population variance * Add VarianceThreshold - feature selection transformer * Add docs about VarianceThreshold * Add missing code for pipeline usage
35 lines
977 B
PHP
35 lines
977 B
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\Math\Statistic\Variance;
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use PHPUnit\Framework\TestCase;
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final class VarianceTest extends TestCase
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{
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/**
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* @dataProvider dataProviderForPopulationVariance
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*/
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public function testVarianceFromInt(array $numbers, float $variance): void
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{
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self::assertEquals($variance, Variance::population($numbers), '', 0.001);
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}
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public function dataProviderForPopulationVariance()
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{
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return [
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[[0, 0, 0, 0, 0, 1], 0.138],
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[[-11, 0, 10, 20, 30], 208.16],
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[[7, 8, 9, 10, 11, 12, 13], 4.0],
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[[300, 570, 170, 730, 300], 41944],
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[[-4, 2, 7, 8, 3], 18.16],
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[[3, 7, 34, 25, 46, 7754, 3, 6], 6546331.937],
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[[4, 6, 1, 1, 1, 1, 2, 2, 1, 3], 2.56],
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[[-3732, 5, 27, 9248, -174], 18741676.56],
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[[-554, -555, -554, -554, -555, -555, -556], 0.4897],
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];
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}
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}
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