__ __ __ __ _____ _ _ _____ _ _ _ | \/ | \ \ / / | __ \ (_) | | / ____| | | | | | \ / |_ __\ V / | |__) | __ ___ ____ _| |_ ___ | (___ | |__ ___| | | | |\/| | '__|> < | ___/ '__| \ \ / / _` | __/ _ \ \___ \| '_ \ / _ \ | | | | | | |_ / . \ | | | | | |\ V / (_| | || __/ ____) | | | | __/ | | |_| |_|_(_)_/ \_\ |_| |_| |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1 if you need WebShell for Seo everyday contact me on Telegram Telegram Address : @jackleetFor_More_Tools:
<?php
declare(strict_types=1);
namespace Phpml\Math\Statistic;
/**
* In probability theory and statistics, variance is the expectation of the squared deviation of a random variable from its mean.
* Informally, it measures how far a set of (random) numbers are spread out from their average value
* https://en.wikipedia.org/wiki/Variance
*/
final class Variance
{
/**
* Population variance
* Use when all possible observations of the system are present.
* If used with a subset of data (sample variance), it will be a biased variance.
*
* ∑⟮xᵢ - μ⟯²
* σ² = ----------
* N
*/
public static function population(array $population): float
{
return StandardDeviation::sumOfSquares($population) / count($population);
}
}
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| ANOVA.php | File | 4.17 KB | 0777 |
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| Correlation.php | File | 880 B | 0777 |
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| Covariance.php | File | 4.21 KB | 0777 |
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| Gaussian.php | File | 1.08 KB | 0777 |
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| Mean.php | File | 1.37 KB | 0777 |
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| StandardDeviation.php | File | 1.33 KB | 0777 |
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| Variance.php | File | 811 B | 0777 |
|