non-central moment
- Parameters:
- x : ndarray
time series data
- windsize : int
window size
- lag : 'lagged', 'centered', or 'leading'
location of window relative to current position
- Returns:
mk – k-th moving non-central moment, with same shape as x
- Return type:
ndarray
Notes
If data x is 2d, then moving moment is calculated for each
column.