Statistic mean The arithmetic mean max The maximum value min The minimum value var The variance dmean The mean of the derivative dmean2 The mean of the second derivative dvar The variance of the derivative dvar2 The variance of the second derivative

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def featurize(y):

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def ess_stats(arr):

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NameError                                 Traceback (most recent call last)
<ipython-input-1-dbdb18d55aa2> in <module>()
----> 1 y.mean()

NameError: name 'y' is not defined

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