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资源说明：JavaScript implementation of the TrueSkill algorithm
trueskill
=========
[TrueSkill](http://research.microsoft.com/en-us/projects/trueskill/) is a
skill-based ranking system developed by Microsoft Research. It is used by Xbox
LIVE to rank and match players. This package implements TrueSkill in
JavaScript as an [npm](http://npmjs.org/) package.
API
---
Import the module.
var trueskill = require('trueskill');
### TrueSkill
`TrueSkill` encodes parameters about the game.
var env = new trueskill.TrueSkill({
mu: 25,
sigma: 25 / 3,
beta: 25 / 6,
tau: 25 / 300,
draw: 0.1
});
where
- `mu`: the initial mean
- `sigma`: the initial standard deviation
- `beta`: the number of skill points to guarantee an 80% chance of winning
- `tau`: the dynamics factor
- `draw`: the probability of a draw in [0, 1]
### Rating
`Rating` encodes a player's rating.
var rating = new trueskill.Rating(mu, sigma);
where
- `mu`: the mean value of the rating
- `sigma`: the standard deviation of the rating
### transformRatings
`transformRatings` calculates updated ratings based prior ratings and the
outcome of a game.
var newRatings = env.transformRatings(
[
{ 'p1': r1, 'p2': r2 },
{ 'p3': r3, 'p4': r4 }
],
[ 2, 1 ]);
where
- `teams`: an array of teams, where each team is a map of player id to prior rating
- `ranks`: the ranks of the teams, where 1 indicates the winner
### matchQuality
`matchQuality` calculates the quality of a match as a function of the probability
of all teams drawing.
var quality = env.matchQuality(
[
{ 'p1': r1, 'p2': r2 },
{ 'p3': r3, 'p4': r4 }
]);
where the `teams` parameter is the same as `transformRatings`.
References
----------
- [TrueSkill](http://research.microsoft.com/en-us/projects/trueskill/)
- [TrueSkill Calculator](http://atom.research.microsoft.com/trueskill/rankcalculator.aspx)
- [Computing Your Skill](http://www.moserware.com/2010/03/computing-your-skill.html)
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