Class: Array

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

Instance Method Summary collapse

Instance Method Details

#mean ⇒ Object 



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# File 'lib/avsd.rb', line 80

def mean
  self.sum / self.length.to_f
end

#sample_variance ⇒ Object 



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# File 'lib/avsd.rb', line 84

def sample_variance
  m = self.mean
  sum = self.reduce(0) { |accum, i| accum + (i - m) ** 2 }
  sum / self.length.to_f
end

#sd ⇒ Object 



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# File 'lib/avsd.rb', line 90

def sd
  Math.sqrt(self.sample_variance)
end

#sum ⇒ Object 



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# File 'lib/avsd.rb', line 76

def sum
  self.reduce(0) { |accum, i| accum + i }
end