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Alex Wulf
2022-07-05 15:55:47 +02:00
parent bfc558d1f2
commit 7d4547df6a
68 changed files with 670 additions and 402 deletions
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21
src/Rating.php
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@@ -1,4 +1,6 @@
<?php namespace DNW\Skills;
<?php
namespace DNW\Skills;
// Container for a player's rating.
use DNW\Skills\Numerics\GaussianDistribution;
@@ -8,14 +10,17 @@ class Rating
const CONSERVATIVE_STANDARD_DEVIATION_MULTIPLIER = 3;
private $_conservativeStandardDeviationMultiplier;
private $_mean;
private $_standardDeviation;
/**
* Constructs a rating.
* @param double $mean The statistical mean value of the rating (also known as mu).
* @param double $standardDeviation The standard deviation of the rating (also known as s).
* @param float|int $conservativeStandardDeviationMultiplier optional The number of standardDeviations to subtract from the mean to achieve a conservative rating.
*
* @param float $mean The statistical mean value of the rating (also known as mu).
* @param float $standardDeviation The standard deviation of the rating (also known as s).
* @param float|int $conservativeStandardDeviationMultiplier optional The number of standardDeviations to subtract from the mean to achieve a conservative rating.
*/
public function __construct($mean, $standardDeviation, $conservativeStandardDeviationMultiplier = self::CONSERVATIVE_STANDARD_DEVIATION_MULTIPLIER)
{
@@ -51,7 +56,7 @@ class Rating
public function getPartialUpdate(Rating $prior, Rating $fullPosterior, $updatePercentage)
{
$priorGaussian = new GaussianDistribution($prior->getMean(), $prior->getStandardDeviation());
$posteriorGaussian = new GaussianDistribution($fullPosterior->getMean(), $fullPosterior . getStandardDeviation());
$posteriorGaussian = new GaussianDistribution($fullPosterior->getMean(), $fullPosterior.getStandardDeviation());
// From a clarification email from Ralf Herbrich:
// "the idea is to compute a linear interpolation between the prior and posterior skills of each player
@@ -60,7 +65,7 @@ class Rating
$precisionDifference = $posteriorGaussian->getPrecision() - $priorGaussian->getPrecision();
$partialPrecisionDifference = $updatePercentage * $precisionDifference;
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian . getPrecisionMean();
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian.getPrecisionMean();
$partialPrecisionMeanDifference = $updatePercentage * $precisionMeanDifference;
$partialPosteriorGaussion = GaussianDistribution::fromPrecisionMean(
@@ -73,6 +78,6 @@ class Rating
public function __toString()
{
return sprintf("mean=%.4f, standardDeviation=%.4f", $this->_mean, $this->_standardDeviation);
return sprintf('mean=%.4f, standardDeviation=%.4f', $this->_mean, $this->_standardDeviation);
}
}
}