Contents

class Array
  def standard_deviation
    Math.sqrt(self.variance)
  end

  def std_dev
    self.standard_deviation
  end

  def coefficient_of_variation
    self.standard_deviation / self.mean
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
rstat-0.1.2	lib/rstat/core_ext/array/descriptive_statistics/dispersion/standard_deviation.rb
rstat-0.1.1	lib/rstat/core_ext/array/descriptive_statistics/dispersion/standard_deviation.rb
rstat-0.1.0	lib/rstat/core_ext/array/descriptive_statistics/dispersion/standard_deviation.rb