22 lines
463 B
Plaintext
22 lines
463 B
Plaintext
StdDeviator = {}
|
|
StdDeviator.count = 0
|
|
StdDeviator.sum = 0
|
|
StdDeviator.sumOfSquares = 0
|
|
|
|
StdDeviator.add = function(x)
|
|
self.count = self.count + 1
|
|
self.sum = self.sum + x
|
|
self.sumOfSquares = self.sumOfSquares + x*x
|
|
end function
|
|
|
|
StdDeviator.stddev = function()
|
|
m = self.sum / self.count
|
|
return sqrt(self.sumOfSquares / self.count - m*m)
|
|
end function
|
|
|
|
sd = new StdDeviator
|
|
for x in [2, 4, 4, 4, 5, 5, 7, 9]
|
|
sd.add x
|
|
end for
|
|
print sd.stddev
|