Class RatingSystems

java.lang.Object

org.episteme.social.sports.RatingSystems

public final class RatingSystems
extends Object

Implementation of various sports rating systems, including Elo and Glicko-2. Provides skill estimation and ranking adjustment algorithms. Modernized to use Real for all calculations to maintain maximum precision.

Since:

1.0

Version:

1.2

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	RatingSystems.Glicko2Rating	Data model for a Glicko-2 rating profile.

Field Summary

Fields

Modifier and Type	Field	Description
static final Real	DEFAULT_K_FACTOR	Default K-factor for standard Elo rating updates.

Method Summary

Modifier and Type	Method	Description
static Real	eloExpectedScore(Real ratingA, Real ratingB)	Calculates the expected outcome for player A vs player B using the Elo formula.
static Real	eloNewRating(Real currentRating, Real opponentRating, Real actualScore, Real kFactor)	Updates an Elo rating after a match result.
static RatingSystems.Glicko2Rating	glicko2Update(RatingSystems.Glicko2Rating player, RatingSystems.Glicko2Rating opponent, Real actualScore)	Updates a Glicko-2 rating for a single match observation.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_K_FACTOR

public static final Real DEFAULT_K_FACTOR

Default K-factor for standard Elo rating updates.

Method Details

eloExpectedScore

public static Real eloExpectedScore(Real ratingA,
 Real ratingB)

Calculates the expected outcome for player A vs player B using the Elo formula.

eloNewRating

public static Real eloNewRating(Real currentRating,
 Real opponentRating,
 Real actualScore,
 Real kFactor)

Updates an Elo rating after a match result.

glicko2Update

public static RatingSystems.Glicko2Rating glicko2Update(RatingSystems.Glicko2Rating player,
 RatingSystems.Glicko2Rating opponent,
 Real actualScore)

Updates a Glicko-2 rating for a single match observation.