params : array-like
The fitted parameters of the model.
start : int, str, or datetime
Zero-indexed observation number at which to start forecasting, ie.,
the first forecast is start. Can also be a date string to
parse or a datetime type.
end : int, str, or datetime
Zero-indexed observation number at which to end forecasting, ie.,
the first forecast is start. Can also be a date string to
parse or a datetime type.
exog : array-like, optional
If the model is an ARMAX and out-of-sample forecasting is
requestion, exog must be given.
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