README.md

glicko2-lite

An implementation of the Glicko-2 rating algorithm written from scratch, with the goal being to provide less conveniences than glicko2js in favor of faster execution time.

Basically glicko2-lite does not keep track of anything for you. All it does is calculate new ratings. At the point where I was trying to calculate ratings for tens of thousands of players across tens of thousands of matches, glicko2js only got slower and slower as more matches were added. For my case at least, I was already saving rating information to a database so all I really needed was the calculation part.

Example

var glicko2 = require('glicko2-lite');

// player A: 1500 rating, 350 rating deviation, and 0.06 volatility
// player B: 2000 rating, 70 rating deviation
// A loses to B
// new rating, rating deviation, and volatility:
glicko2(1500, 350, 0.06, [[2000, 70, 0]])
// => {
// =>   rating: 1467.5878493169462,
// =>   rd: 318.6617548537152,
// =>   vol: 0.059999457650202655
// => }

Installation

$ npm install glicko2-lite

API

var glicko2 = require('glicko2-lite');

glicko2(rating, rd, vol, matches, [options])

• rating (Number)
• rd (Number)
• vol (Number)
• matches (Array)
• options (Object)