Contents

require File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'fathom'))
class Fathom::Distributions::Uniform
  extend Fathom::Distributions::SharedMethods
  class << self
    def rng
      @rng ||= GSL::Rng.alloc(GSL::Rng::MT19937_1999, Kernel.rand(100_000))
    end
    
    def rand
      rng.ugaussian
    end
    
    def inverse_cdf(opts={})
      mean = opts[:mean]
      lower = opts.fetch(:lower, true)
      lower = false if opts[:upper]
      confidence_interval = opts.fetch(:confidence_interval, 0.05)
      value = lower ? GSL::Cdf.ugaussian_Pinv(confidence_interval) : GSL::Cdf.ugaussian_Qinv(confidence_interval)
      value + mean
    end
    alias :lower_bound :inverse_cdf

    def upper_bound(opts={})
      inverse_cdf(opts.merge(:lower => false))
    end

    def interval_values(opts={})
      confidence_interval = opts.fetch(:confidence_interval, 0.9)
      bound = (1 - confidence_interval) / 2.0
      [lower_bound(opts.merge(:confidence_interval => bound)), upper_bound(opts.merge(:confidence_interval => bound))]
    end
    
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
fathom-0.3.7	lib/fathom/distributions/uniform.rb
fathom-0.3.6	lib/fathom/distributions/uniform.rb
fathom-0.3.4	lib/fathom/distributions/uniform.rb
fathom-0.3.3	lib/fathom/distributions/uniform.rb
fathom-0.3.2	lib/fathom/distributions/uniform.rb
fathom-0.3.1	lib/fathom/distributions/uniform.rb
fathom-0.3.0	lib/fathom/distributions/uniform.rb
fathom-0.2.3	lib/fathom/distributions/uniform.rb