Glicko2
Implementation of Glicko2 ratings.
Based on Mark Glickman's paper http://www.glicko.net/glicko/glicko2.pdf
Installation
Add this line to your application's Gemfile:
gem 'glicko2'
And then execute:
$ bundle
Or install it yourself as:
$ gem install glicko2
Usage
require 'glicko2'
# Objects to store Glicko ratings
Rating = Struct.new(:rating, :rating_deviation, :volatility)
rating1 = Rating.new(1400, 30, 0.06)
rating2 = Rating.new(1550, 100, 0.06)
# Rating period with all participating ratings
period = Glicko2::RatingPeriod.from_objs [rating1, rating2]
# Register a game where rating1 wins against rating2
period.game([rating1, rating2], [1,2])
# Generate the next rating period with updated players
next_period = period.generate_next(0.5)
# Update all Glicko ratings
next_period.players.each { |p| p.update_obj }
# Output updated Glicko ratings
puts rating1
puts rating2Contributing
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request