If an integer, the number of steps to forecast from the end of the sample. Can also be a date string to parse or a datetime type. However, if the dates index does not have a fixed frequency, steps must be an integer.
A replacement exogenous array. Must have the same shape as the exogenous data array used when the model was created.
Array of out of in-sample predictions and / or out-of-sample forecasts.
In- and out-of-sample predictions