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Cleanup in src/, adding namespaces, removing php closing tag and general code cleanup

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Alexander Liljengård
2016-05-24 14:10:39 +02:00
parent 9f97eb1653
commit 5694a2fb30
64 changed files with 891 additions and 1328 deletions
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33
src/Rating.php
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@ -1,12 +1,12 @@
<?php
namespace Moserware\Skills;
<?php namespace Moserware\Skills;
// Container for a player's rating.
class Rating
use Moserware\Skills\Numerics\GaussianDistribution;
class Rating
{
const CONSERVATIVE_STANDARD_DEVIATION_MULTIPLIER = 3;
private $_conservativeStandardDeviationMultiplier;
private $_mean;
private $_standardDeviation;
@ -15,7 +15,7 @@ class Rating
* 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 double $conservativeStandardDeviationMultiplier optional The number of standardDeviations to subtract from the mean to achieve a conservative rating.
* @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)
{
@ -29,7 +29,7 @@ class Rating
*/
public function getMean()
{
return $this->_mean;
return $this->_mean;
}
/**
@ -45,27 +45,28 @@ class Rating
*/
public function getConservativeRating()
{
return $this->_mean - $this->_conservativeStandardDeviationMultiplier*$this->_standardDeviation;
return $this->_mean - $this->_conservativeStandardDeviationMultiplier * $this->_standardDeviation;
}
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
// ... in the canonical space of parameters"
$precisionDifference = $posteriorGaussian->getPrecision() - $priorGaussian->getPrecision();
$partialPrecisionDifference = $updatePercentage*$precisionDifference;
$partialPrecisionDifference = $updatePercentage * $precisionDifference;
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian.getPrecisionMean();
$partialPrecisionMeanDifference = $updatePercentage*$precisionMeanDifference;
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian . getPrecisionMean();
$partialPrecisionMeanDifference = $updatePercentage * $precisionMeanDifference;
$partialPosteriorGaussion = GaussianDistribution::fromPrecisionMean(
$priorGaussian->getPrecisionMean() + $partialPrecisionMeanDifference,
$priorGaussian->getPrecision() + $partialPrecisionDifference);
$priorGaussian->getPrecision() + $partialPrecisionDifference
);
return new Rating($partialPosteriorGaussion->getMean(), $partialPosteriorGaussion->getStandardDeviation(), $prior->_conservativeStandardDeviationMultiplier);
}
@ -73,7 +74,5 @@ class Rating
public function __toString()
{
return sprintf("mean=%.4f, standardDeviation=%.4f", $this->_mean, $this->_standardDeviation);
}
}
?>
}
}