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Mon Jan 2 18:02:56 EST 2017

Running mean/variance

2s^2 = (a - m)^2 + (b - m)^2 = a^2 + b^2 - 2m^2  with 2m = a + b

general case:

s^2 = 1/n sum x_i^2 - (1/n sum x_i)^2




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