While automatic selection of an ARIMA model should be completely adequate, if results are different from what you expect and you are familiar with ARIMA methodology and model construction, you can create and edit ARIMA models in Predictor.
To use custom models for ARIMA forecasting:
In the Autoregressive Integrated Moving Average (ARIMA) Details panel, select Custom models.
Click a button to add, edit, or remove a model:
Add (Alt+d), enables you to create a new model, as described in Adding Custom ARIMA Models.
Edit (Alt+e), enables you to modify the selected model, as described in Editing Custom ARIMA Models.
Remove (Alt+v), permanently deletes the selected model.
Note: | Displayed models are fitted to each series. Custom seasonal models are not fitted to non-seasonal series, but non-seasonal models are fitted to seasonal series. |