Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/gauntlet.rb

Instance Method Summary collapse

Instance Method Details

#average ⇒ Object 



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# File 'lib/gauntlet.rb', line 321

def average
  return self.sum / self.length.to_f
end

#sample_variance ⇒ Object 



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# File 'lib/gauntlet.rb', line 325

def sample_variance
  avg = self.average
  sum = 0
  self.each { |i| sum += (i - avg) ** 2 }
  return (1 / self.length.to_f * sum)
end

#stddev ⇒ Object 



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# File 'lib/gauntlet.rb', line 332

def stddev
  return Math.sqrt(self.sample_variance)
end

#sum ⇒ Object 



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# File 'lib/gauntlet.rb', line 315

def sum
  sum = 0
  self.each { |i| sum += i }
  sum
end