TrueSkill
Installation
Simply run npm install trueskill
Background
This library implements the TrueSkill(TM) ranking system and is a port of the python library https://github.com/dougz/trueskill.
Usage
// The output of this program should match the output of the TrueSkill// calculator at://// http://atom.research.microsoft.com/trueskill/rankcalculator.aspx//// (Select game mode "custom", create 4 players each on their own team,// check the second "Draw?" box to indicate a tie for second place,// then click "Recalculate Skill Level Distribution". The mu and sigma// values in the "after game" section should match what this program// prints. // The objects we pass to AdjustPlayers can be anything with skill and// rank attributes. // Create four players. Assign each of them the default skill. The// player ranking (their "level") is mu-3*sigma, so the default skill// value corresponds to a level of 0. alice = {}aliceskill = 250 250/30 bob = {}bobskill = 250 250/30 chris = {}chrisskill = 250 250/30 darren = {}darrenskill = 250 250/30 // The four players play a game. Alice wins, Bob and Chris tie for// second, Darren comes in last. The actual numerical values of the// ranks don't matter, they could be (1, 2, 2, 4) or (1, 2, 2, 3) or// (23, 45, 45, 67). All that matters is that a smaller rank beats a// larger one, and equal ranks indicate draws. alicerank = 1bobrank = 2chrisrank = 2darrenrank = 4 // Do the computation to find each player's new skill estimate. trueskill = ;trueskill; // Print the results. console;console;console;console;console;console;console;console;