non-central moment
x : array
time series data
windsize : int
window size
lag : ‘lagged’, ‘centered’, or ‘leading’
location of window relative to current position
mk : array
k-th moving non-central moment, with same shape as x
Notes
If data x is 2d, then moving moment is calculated for each column.
sm.sandbox.tsa.movmean
sm.sandbox.tsa.movorder
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