/** * Calculates the new rating * * @param class_module_rating_rate $objSourceRate The rating-record to update * @param float $floatNewRating The rating fired by the user * * @return float the new rating */ public function doRating(class_module_rating_rate $objSourceRate, $floatNewRating) { //calc the rating's midpoint depending on the maximum rating value $floatRatingMidpoint = (class_module_rating_rate::$intMaxRatingValue + 1) / 2; $floatAssessedRating = 0; if ($floatNewRating == $floatRatingMidpoint) { //the rating exactly matches the average rating value //it doesn't need to be assessed $floatAssessedRating = $floatNewRating; } else { //determine the interval between assessed ratings //the number 0.5 is to the maximum change which is applied to a rating during assessment //a more probable rating and a higher number of ratings will make this interval less meaningful $floatAssessmentInterval = 0.5 / ($floatRatingMidpoint - 1); //calc the assessment on the current rating $floatAssessedRating = ($floatRatingMidpoint - $floatNewRating) * $floatAssessmentInterval + $floatNewRating; //add or subtract a bonus depending on the number of already existing ratings $intAdditionSign = 1; if ($floatNewRating < $floatRatingMidpoint) { $intAdditionSign = -1; } $floatAssessedRating = $floatAssessedRating + $intAdditionSign * ($objSourceRate->getIntHits() / class_module_rating_algo_gaussian::$intAssessmentSoftenerFactor * 2); //reset the final assessed ratings if they should exceed the user's rating //this could only happen with a high number of ratings on an object if ($floatNewRating < $floatRatingMidpoint && $floatAssessedRating < $floatNewRating || $floatNewRating > $floatRatingMidpoint && $floatAssessedRating > $floatNewRating) { $floatAssessedRating = $floatNewRating; } } //calc the new rating $floatNewRating = ($objSourceRate->getFloatRating() * $objSourceRate->getIntHits() + $floatAssessedRating) / ($objSourceRate->getIntHits() + 1); return $floatNewRating; }
/** * Calculates the new rating * * @param class_module_rating_rate $objSourceRate The rating-record to update * @param float $floatNewRating The rating fired by the user * * @return float the new rating */ public function doRating(class_module_rating_rate $objSourceRate, $floatNewRating) { //calc the new rating $floatNewRating = ($objSourceRate->getFloatRating() * $objSourceRate->getIntHits() + $floatNewRating) / ($objSourceRate->getIntHits() + 1); return $floatNewRating; }