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Rename of variable to make things clearer. See #4

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This commit is contained in:
Alexander Liljengård 2016-05-24 21:50:55 +02:00
parent a65f2aa9f3
commit c898353497
1 changed files with 3 additions and 3 deletions
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6
src/TrueSkill/TwoTeamTrueSkillCalculator.php
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@ -169,7 +169,7 @@ class TwoTeamTrueSkillCalculator extends SkillCalculator
$team1StdDevSquared = BasicMath::sum($team1Ratings, $varianceGetter);
$team2MeanSum = BasicMath::sum($team2Ratings, $meanGetter);
$team2SigmaSquared = BasicMath::sum($team2Ratings, $varianceGetter);
$team2StdDevSquared = BasicMath::sum($team2Ratings, $varianceGetter);
// This comes from equation 4.1 in the TrueSkill paper on page 8
// The equation was broken up into the part under the square root sign and
@ -178,13 +178,13 @@ class TwoTeamTrueSkillCalculator extends SkillCalculator
$sqrtPart = sqrt(
($totalPlayers * $betaSquared)
/
($totalPlayers * $betaSquared + $team1StdDevSquared + $team2SigmaSquared)
($totalPlayers * $betaSquared + $team1StdDevSquared + $team2StdDevSquared)
);
$expPart = exp(
(-1 * BasicMath::square($team1MeanSum - $team2MeanSum))
/
(2 * ($totalPlayers * $betaSquared + $team1StdDevSquared + $team2SigmaSquared))
(2 * ($totalPlayers * $betaSquared + $team1StdDevSquared + $team2StdDevSquared))
);
return $expPart * $sqrtPart;