Survival

Functions related to survival analysis, such as Kaplan-Meier estimator of survival curves.

Installation

Add this line to your application's Gemfile:

gem 'survival'

And then execute:

$ bundle

Or install it yourself as:

$ gem install survival

Usage

To generate a Kaplan-Meier survival curve:

#survivals is an array of hashes. Each hash represents a sample, and must define 
#   :event (the event time)
#   :censored (boolean describing whether this sample is right-censored)
survivals = [{:event => 21, :censored => false}, {:event => 13, :censored => true}, ... ]
survival_objs = SurvivalSample.create_survival_objects(survivals) #Create survival sample objects
points = KaplanMeier.generate_plot_points(survival_objs) #Generate the x,y coordinates of the survival curve

#points is an array of [x,y] pairs for plotting. Use your favorite plotting library to plot the line graph.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request