FalseSkill

A literal implementation of the Glicko-2 rating system in TypeScript. Got it?

Usage

The make script generates an AMD module from the TypeScript sources. The npm package ( npm install falseskill ) uses amdefine to expose it as a CommonJS module.

• falseskill.ts is the commented TypeScript source
• falseskill.d.ts is just the TypeScript definition
• falseskill.js is the transpiled AMD module
• falseskill.js.map is the source map for the former, referencing falseskill.ts
• falseskill.min.js is the compressed AMD module
• falseskill.min.js.map is the source map for the former, referencing falseskill.ts

API

Configuration:

// Defaults
falseskill.Tau = 0.75
falseskill.InitialRating = 1500
falseskill.InitialDeviation = 350
falseskill.InitialVolatility = 0.06

Create a rating for a new player:

falseskill.newRating() : PlayerRating

Calculate a player's new rating once a rating period has concluded:

falseskill.calculateRating(player : PlayerRating, opponents : OpponentRating[], outcomes : number[]) : PlayerRating

Or update in place:

falseskill.updateRating(player : PlayerRating, opponents : OpponentRating[], outcomes : number[]) : void

Calculate the rating of a player who has not competed in the rating period:

falseskill.calculateRatingDidNotCompete(player : PlayerRating) : PlayerRating

Or update in place:

falseskill.updateRatingDidNotCompete(player : PlayerRating) : void

Copy an already calculated rating to a player:

falseskill.copyRating(from : PlayerRating, to : PlayerRating) : PlayerRating

Derive a set of matches from a multiplayer (3+ players) game:

falseskill.deriveMatches(rankings : Ranking[], filterBy? : PlayerRating) : Match[]

Update ratings in place, for a set of matches played:

falseskill.updateRatings(matches : Match[]) : void

Calculate the presumed match quality in advance:

falseskill.calculateMatchQuality(player : PlayerRating, opponents : OpponentRating[]) : MatchQuality

Interfaces and constants

falseskill.Loss = 0.0
falseskill.Draw = 0.5
falseskill.Win  = 1.0

interface OpponentRating {
    rating     : number,
    deviation  : number
}

interface PlayerRating extends OpponentRating {
    volatility : number
}

interface Ranking extends Array<PlayerRating> { }

interface Match {
    player    : PlayerRating,
    opponents : OpponentRating[],
    outcomes  : number[]
}

interface MatchQuality {
    qualities : number[],
    min       : number,
    max       : number,
    avg       : number,
    med       : number,
    str       : number
}

See falseskill.ts for detailed documentation.

License: Apache License, Version 2.0