IrtRuby is a Ruby gem that provides implementations of the Rasch model, the Two-Parameter model, and the Three-Parameter model for Item Response Theory (IRT). It allows you to estimate the abilities of individuals and the difficulties of items based on their responses to a set of items.
Add this line to your application's Gemfile:
gem 'irt_ruby'And then execute:
bundle installOr install it yourself as:
gem install irt_rubyHere's an example of how to use the IrtRuby gem:
require 'irt_ruby'
require 'matrix'
# Create a sample response matrix
data = Matrix[[1, 0, 1], [0, 1, 0], [1, 1, 1]]
# Initialize the Rasch model with the response data
model = IrtRuby::RaschModel.new(data)
# Fit the model to estimate abilities and difficulties
result = model.fit
# Output the estimated abilities and difficulties
puts "Abilities: #{result[:abilities]}"
puts "Difficulties: #{result[:difficulties]}"After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/SyntaxSpirits/irt_ruby. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.
The gem is available as open source under the terms of the MIT License.
Everyone interacting in the IrtRuby project's codebases, issue trackers, chat rooms, and mailing lists is expected to follow the code of conduct.