Module: Enumerable

Defined in:
lib/ms/curvefit/curve_fit_helper.rb

Instance Method Summary collapse

Instance Method Details

#mean ⇒ Object 



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# File 'lib/ms/curvefit/curve_fit_helper.rb', line 10

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

#sample_variance(mean) ⇒ Object 



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# File 'lib/ms/curvefit/curve_fit_helper.rb', line 14

def sample_variance(mean)
  m = mean
  sum = self.inject(0){|accum, i| accum +(i-m)**2 }
  sum/(self.length - 1).to_f
end

#standard_deviation(mean = self.mean) ⇒ Object 



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# File 'lib/ms/curvefit/curve_fit_helper.rb', line 20

def standard_deviation(mean = self.mean)
  return Math.sqrt(self.sample_variance(mean))
end

#sum ⇒ Object 



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# File 'lib/ms/curvefit/curve_fit_helper.rb', line 6

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