If the fitting effect is good, the model can be predicted; that is, according to the experience summarized in the forecasting work, when the data series shows a stable trend and no obvious fluctuations, it is more appropriate to choose between 0.1 and 0.3; when the data series shows a stable trend but there are obvious fluctuations, it should be between 0.3 and 0.5; when the data series has a clear trend and fluctuates, it is more reasonable to choose between 0.5 and 0.8.
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Research on GDP Forecast Analysis Combining BP Neural Network and ARIMA Model.
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