Class: Statistics::Distribution::Bernoulli

Inherits:
Object
  • Object
show all
Defined in:
lib/statistics/distribution/bernoulli.rb

Class Method Summary collapse

Class Method Details

.cumulative_function(n, p) ⇒ Object 



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# File 'lib/statistics/distribution/bernoulli.rb', line 13

def self.cumulative_function(n, p)
  return if n != 0 && n != 1 # The support of the distribution is n = {0, 1}.

  case n
  when 0 then 1.0 - p
  when 1 then 1.0
  end
end

.density_function(n, p) ⇒ Object 



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# File 'lib/statistics/distribution/bernoulli.rb', line 4

def self.density_function(n, p)
  return if n != 0 && n != 1 # The support of the distribution is n = {0, 1}.

  case n
  when 0 then 1.0 - p
  when 1 then p
  end
end

.kurtosis(p) ⇒ Object 



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# File 'lib/statistics/distribution/bernoulli.rb', line 30

def self.kurtosis(p)
  (6.0 * (p ** 2) - (6 * p) + 1) / (p * (1.0 - p))
end

.skewness(p) ⇒ Object 



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# File 'lib/statistics/distribution/bernoulli.rb', line 26

def self.skewness(p)
  (1.0 - 2.0*p).to_r / Math.sqrt(p * (1.0 - p))
end

.variance(p) ⇒ Object 



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# File 'lib/statistics/distribution/bernoulli.rb', line 22

def self.variance(p)
  p * (1.0 - p)
end