Method: Array#stdev

Defined in:
lib/jkr/array.rb

#stdev ⇒ Object 



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# File 'lib/jkr/array.rb', line 15

def stdev()
  avg = self.avg
  var = self.map{|val| (val - avg) ** 2}.sum
  if self.size > 1
    var /= self.size - 1
  end
  Math.sqrt(var)
end