Hi all a quick question regarding ARMA models.
If a time series has an upward trend (or any trend), and it then becomes de-trended by a linear regression to which an ARMA model is fitted, is it possible to incorporate this trend in the time series model?
If a time series has an upward trend (or any trend), and it then becomes de-trended by a linear regression to which an ARMA model is fitted, is it possible to incorporate this trend in the time series model?
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