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mehitabel/gist:6265743

Created August 19, 2013 04:21
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gistfile1.py
from math import sqrt
def std_dev_over_mean(n, p):
""" increment a counter by 1/p with probability p, n times. (independently) """
q = 1 - p
var = n * q / p
return sqrt(var) / n
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