public RatingInfoDoubles.WeightingFactors CalculateMatchWeight(TeamInfo playerTeam, TeamInfo opponentTeam, Result r, int numPartnerResults)
{
/*
* Match Weight is A x B x C x D * E * F
* Where:
* A = Opponent's Player Rating Reliability
* B = Parter Frequency
* C = Match Competitiveness Factor
* D = Opponent Benchmark Reliability Factor
* E = Interpool Reliability Factor
* F = Team Rating Reliability
*/
var a = (_ratingRule.EnableMatchFormatReliability) ? CalculateMatchFormatReliabilityFactor(r) : 10.0f;
var b = _ratingRule.EnablePartnerFrequencyReliability ? CalculatePartnerFrequency(numPartnerResults) : 1.0f;
var c = (_ratingRule.EnableMatchCompetitivenessCoeffecient) ? MatchCompetivenessCalculator.CalculateMatchCompetivenessCoeffecient(playerTeam, opponentTeam, r, _ratingRule) : 1.0f;
var d = 1.0f; // not yet used
var e = (_ratingRule.EnableInterpoolCoeffecient) ? CalculateInterpoolCoefficient(playerTeam, opponentTeam) : 1.0f;
var f = CalculateOpponentRatingReliabilityFactor(opponentTeam);
var matchWeight = a * b * c * d * e * f;
return(new RatingInfoDoubles.WeightingFactors
{
MatchFormatReliability = a,
MatchFrequencyReliability = b,
MatchCompetitivenessCoeffecient = c,
BenchmarkMatchCoeffecient = d,
OpponentRatingReliability = f,
InterpoolCoeffecient = e,
MatchWeight = Math.Truncate(100000 * matchWeight) / 100000
});
}
private float CalculateInterpoolCoefficient(TeamInfo playerTeam, TeamInfo opponentTeam)
{
// any diff in country ids
var isForeignMatch = playerTeam.Player1CountryId != opponentTeam.Player1CountryId ||
playerTeam.Player1CountryId != opponentTeam.Player2CountryId ||
playerTeam.Player2CountryId != opponentTeam.Player2CountryId;
if (playerTeam.HasCollegePlayer ^ opponentTeam.HasCollegePlayer)
{
return(_ratingRule.interpoolCoefficientCollege);
}
return(isForeignMatch ? _ratingRule.interpoolCoefficientCountry : 1.0f);
}
public Result.MatchGender GetGenderType(TeamInfo team1, TeamInfo team2)
{
var genders = new List <string>()
{
team1.Player1Gender, team1.Player2Gender, team2.Player1Gender, team2.Player2Gender
};
if (genders.Contains("M") && genders.Contains("F"))
{
return(Result.MatchGender.Coed);
}
if (genders.Contains("M"))
{
return(Result.MatchGender.Male);
}
if (genders.Contains("F"))
{
return(Result.MatchGender.Female);
}
throw new RatingException("Unable to determine result gender type");
}
// same thing but with team ratings
public static float CalculateUnderdogMatch(TeamInfo playerTeam, TeamInfo opponentTeam, Result matchInfo, RatingRule rule)
{
TeamInfo winner, loser;
if (matchInfo.Winner1Id == playerTeam.Player1Id || matchInfo.Winner1Id == playerTeam.Player2Id)
{
winner = playerTeam;
loser = opponentTeam;
}
else
{
winner = opponentTeam;
loser = playerTeam;
}
if (winner.TeamRating > loser.TeamRating && !CompetiveThresholdReached(matchInfo)) //If the expected team won and the loser didn't reach competitive threshold, it's expected.
{
return(rule.UnderDogMatchReliability);
}
else //Underdog was competitive
{
return(rule.CompetitiveUnderDogMatchReliability);
}
}
// same thing but with team ratings
public static float CalculateMatchCompetivenessCoeffecient(TeamInfo playerTeam, TeamInfo opponentTeam, Result matchInfo, RatingRule rule)
{
float UTRDelta = (float)Math.Abs(playerTeam.TeamRating - opponentTeam.TeamRating), coeffecient = 1;
if (UTRDelta <= rule.NormalMatchMaxUTRDelta && UTRDelta >= rule.CloseMatchMaxUTRDelta) //Normal match
{
coeffecient = DoCoeffcientCalculation(UTRDelta, rule);
}
else if (UTRDelta < rule.CloseMatchMaxUTRDelta) // Close Match
{
coeffecient = IsMatchLopsided(matchInfo, rule) ? rule.LopsidedMatchReliability : DoCoeffcientCalculation(UTRDelta, rule); //If a close match is lopsided, we assume one player must have been having an off game, reduced credit
}
else if (UTRDelta > rule.NormalMatchMaxUTRDelta) //Lopsided Match
{
coeffecient = CalculateUnderdogMatch(playerTeam, opponentTeam, matchInfo, rule); //Underdog matches, where player's have a large skill gap, calculate differently
}
else
{
throw new RatingException("Unable to determine competitiveness coeficcient for result id: " + matchInfo.Id);
//coeffecient = 0.0f; //Fail safe, every match should be caught above, may want to throw exception here
}
return(coeffecient);
}
public int GetPartnerResults(TeamInfo team, List <Result> results)
{
var count = 0;
foreach (var r in results)
{
var team1Ids = new List <int> {
r.Winner1Id, r.Winner2Id ?? 0
};
var team2Ids = new List <int> {
r.Loser1Id, r.Loser2Id ?? 0
};
if (team1Ids.Contains(team.Player1Id) && team1Ids.Contains(team.Player2Id))
{
count++;
}
if (team2Ids.Contains(team.Player1Id) && team2Ids.Contains(team.Player2Id))
{
count++;
}
}
return(count > 0 ? count : 1);
}
public double CalculateDynamicRating(int playerId, TeamInfo playerTeam, TeamInfo opponentTeam, Result result)
{
// Effect of Partner-UTR-Spread on Team Adjustment Factor
var matchPartnersDelta = playerTeam.RatingDiff - opponentTeam.RatingDiff;
var baseline = CalculateMatchBaseline(playerTeam.TeamRating, opponentTeam.TeamRating);
var teamAdjustment = CalculateTeamAdjustmentFactor(playerId, result, matchPartnersDelta, baseline, GetGenderType(playerTeam, opponentTeam));
var teamDynamicRating = CalculateTeamDynamicRating(baseline, teamAdjustment);
// determine which position player is in
if (playerId == playerTeam.Player1Id)
{
// calc dynamic rating as if partner rating was the same and cap there
var playerTeamDynamicRating = CalculateTeamDynamicRating(CalculateMatchBaseline(playerTeam.Player1Rating, opponentTeam.TeamRating), teamAdjustment);
var dynamicCap = (playerTeamDynamicRating);
var dynamic = (teamDynamicRating - playerTeam.TeamRating) + playerTeam.Player1Rating;
dynamic = Clamp(dynamic, 1, dynamicCap);
if (_ratingRule.EnableDynamicRatingCap)
{
return(playerTeam.Player1Gender.ToLower() == "m" ? Math.Min(16.5f, dynamic) : Math.Min(13.5f, dynamic));
}
// cap dynamic
return(dynamic);
}
if (playerId == playerTeam.Player2Id)
{
var playerTeamDynamicRating = CalculateTeamDynamicRating(CalculateMatchBaseline(playerTeam.Player2Rating, opponentTeam.TeamRating), teamAdjustment);
var dynamicCap = (playerTeamDynamicRating);
var dynamic = (teamDynamicRating - playerTeam.TeamRating) + playerTeam.Player2Rating;
dynamic = Clamp(dynamic, 1, dynamicCap);
if (_ratingRule.EnableDynamicRatingCap)
{
return(playerTeam.Player2Gender.ToLower() == "m" ? Math.Min(16.5f, dynamic) : Math.Min(13.5f, dynamic));
}
return(dynamic);
}
throw new RatingException("Could not map player to team");
}
private static double CalculateOpponentRatingReliabilityFactor(TeamInfo opponentTeam)
{
// mean of opponent reliabilities
return(opponentTeam.TeamReliability);
}
public RatingInfoDoubles CalculateDoublesUtr(List <Result> results, Dictionary <int, Player> players, Player player)
{
var ratingInfo = new RatingInfoDoubles();
double sumWeight = 0;
double sumDynamicXWeight = 0;
double sumPlayerReliabilityWeight = 0;
int resultCount = 0;
var eligibleResultsList = new List <int>();
foreach (var result in results)
{
var winner1 = players[result.Winner1Id];
var winner2 = players[result.Winner2Id ?? 0];
var loser1 = players[result.Loser1Id];
var loser2 = players[result.Loser2Id ?? 0];
if (winner1 == null || winner2 == null || loser1 == null || loser2 == null)
{
continue;
}
double w1Reliability;
double w2Reliability;
double l1Reliability;
double l2Reliability;
// this value should be pre-calculated
var isCompetitiveResult =
result.Competitiveness.Equals("Competitive", StringComparison.OrdinalIgnoreCase);
winner1.Stats.AssignedRating = AssignPlayerRatingForDoubles(winner1, winner2, loser1, loser2, isCompetitiveResult, out w1Reliability);
winner2.Stats.AssignedRating = AssignPlayerRatingForDoubles(winner2, winner1, loser1, loser2, isCompetitiveResult, out w2Reliability);
loser1.Stats.AssignedRating = AssignPlayerRatingForDoubles(loser1, loser2, winner1, winner2, isCompetitiveResult, out l1Reliability);
loser2.Stats.AssignedRating = AssignPlayerRatingForDoubles(loser2, loser1, winner1, winner2, isCompetitiveResult, out l2Reliability);
// skip result if someone cannot be assigned
if (winner1.Stats.AssignedRating == null ||
winner2.Stats.AssignedRating == null ||
loser1.Stats.AssignedRating == null ||
loser2.Stats.AssignedRating == null)
{
continue;
}
winner1.Stats.AssignedReliability = w1Reliability;
winner2.Stats.AssignedReliability = w2Reliability;
loser1.Stats.AssignedReliability = l1Reliability;
loser2.Stats.AssignedReliability = l2Reliability;
TeamInfo playerTeam;
TeamInfo opponentTeam;
// identify player's team
if (player.Id == winner1.Id || player.Id == winner2.Id)
{
playerTeam = new TeamInfo(winner1, winner2, false);
opponentTeam = new TeamInfo(loser1, loser2, true);
}
else
{
playerTeam = new TeamInfo(loser1, loser2, false);
opponentTeam = new TeamInfo(winner1, winner2, true);
}
if (opponentTeam.TeamReliability <= 0)
{
continue;
}
var dynamic = CalculateDynamicRating(player.Id, playerTeam, opponentTeam, result);
dynamic = Math.Truncate(1000 * dynamic) / 1000;
var numPartnerResults = GetPartnerResults(playerTeam, results);
var matchWeights = CalculateMatchWeight(playerTeam, opponentTeam, result, numPartnerResults);
if (matchWeights.MatchWeight >= _ratingRule.eligibleResultsWeightThreshold)
{
eligibleResultsList.Add(result.Id);
}
sumDynamicXWeight += (dynamic * matchWeights.MatchWeight);
sumWeight += matchWeights.MatchWeight;
// divide by interpool coefficient so it doesn't skew player reliability
sumPlayerReliabilityWeight += (matchWeights.MatchWeight / matchWeights.InterpoolCoeffecient);
resultCount++;
}
// store active doubles results
player.Stats.ActiveDoublesResults = JsonConvert.SerializeObject(eligibleResultsList.ToArray());
var n = resultCount;
// if no valid results, don't calculate
if (n <= 0)
{
ratingInfo.Rating = 0;
ratingInfo.Reliability = 0;
return(ratingInfo);
}
var doublesUtr = (sumWeight > 0) ? (sumDynamicXWeight / sumWeight) : 1d;
var doublesReliability = players[player.Id].Stats.AssignedReliability;
var singlesReliabilityAsPercent = ((player.Stats.RatingReliability ?? 0) / 10);
var doublesReliabilityAsPercent = (doublesReliability / 10);
// Determination of Player’s (Singles) UTR and corresponding Player’s (singles) UTR Reliability. Factor in if available
var singlesWeight = player.Stats.RatingReliability >= _ratingRule.singlesWeightReliabilityThreshold
? _ratingRule.singlesWeightOnDoubles
: 0;
if (player.Stats.FinalRating > 0 && player.Stats.RatingReliability > 0)
{
ratingInfo.Rating = ((n * (doublesUtr * doublesReliabilityAsPercent)) + (singlesWeight * ((player.Stats.FinalRating ?? 0) * singlesReliabilityAsPercent))) / ((n * doublesReliabilityAsPercent) + (singlesWeight * singlesReliabilityAsPercent));
}
else
{
ratingInfo.Rating = (n * (doublesUtr * doublesReliabilityAsPercent)) / (n * doublesReliabilityAsPercent);
}
ratingInfo.Reliability = CalculatePlayerReliability(sumPlayerReliabilityWeight);
return(ratingInfo);
}