Created
February 17, 2018 23:36
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| mean = self.get_simple_moving_average(day) | |
| derivations = [price - mean for price in self.prices[-day:]] | |
| squared_deviations = [numpy.square(derivation) for derivation in derivations] | |
| sum_squared_deviations = sum(squared_deviations) | |
| return numpy.sqrt(sum_squared_deviations / day) |
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