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More return types. Basic example

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Jens True
2023-08-02 09:04:56 +00:00
parent f0aa9413e1
commit 32b8a9d83e
13 changed files with 71 additions and 33 deletions
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14
src/Rating.php
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@ -16,14 +16,14 @@ class Rating implements \Stringable
* @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(private $_mean, private $_standardDeviation, private $_conservativeStandardDeviationMultiplier = self::CONSERVATIVE_STANDARD_DEVIATION_MULTIPLIER)
public function __construct(private float $_mean, private float $_standardDeviation, private float|int $_conservativeStandardDeviationMultiplier = self::CONSERVATIVE_STANDARD_DEVIATION_MULTIPLIER)
{
}
/**
* The statistical mean value of the rating (also known as <EFBFBD>).
* The statistical mean value of the rating (also known as mu).
*/
public function getMean()
public function getMean(): float
{
return $this->_mean;
}
@ -31,7 +31,7 @@ class Rating implements \Stringable
/**
* The standard deviation (the spread) of the rating. This is also known as s.
*/
public function getStandardDeviation()
public function getStandardDeviation(): float
{
return $this->_standardDeviation;
}
@ -39,12 +39,12 @@ class Rating implements \Stringable
/**
* A conservative estimate of skill based on the mean and standard deviation.
*/
public function getConservativeRating()
public function getConservativeRating(): float
{
return $this->_mean - $this->_conservativeStandardDeviationMultiplier * $this->_standardDeviation;
}
public function getPartialUpdate(Rating $prior, Rating $fullPosterior, $updatePercentage)
public function getPartialUpdate(Rating $prior, Rating $fullPosterior, $updatePercentage): Rating
{
$priorGaussian = new GaussianDistribution($prior->getMean(), $prior->getStandardDeviation());
$posteriorGaussian = new GaussianDistribution($fullPosterior->getMean(), $fullPosterior . getStandardDeviation());
@ -56,7 +56,7 @@ class Rating implements \Stringable
$precisionDifference = $posteriorGaussian->getPrecision() - $priorGaussian->getPrecision();
$partialPrecisionDifference = $updatePercentage * $precisionDifference;
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian . getPrecisionMean();
$precisionMeanDifference = $posteriorGaussian->getPrecisionMean() - $priorGaussian->getPrecisionMean();
$partialPrecisionMeanDifference = $updatePercentage * $precisionMeanDifference;
$partialPosteriorGaussion = GaussianDistribution::fromPrecisionMean(