Autocovariance for 1D
x : array
time series data
unbiased : bool
if True, then denominators is n-k, otherwise n
fft : bool
If True, use FFT convolution. This method should be preferred for long time series.
acovf : array
autocovariance function
statsmodels.tsa.interp.denton.dentonm
statsmodels.tsa.stattools.acf
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