Setting double exponential smoothing parameters

A double exponential smoothing allows for exponentially decreasing weights that are applied to both previous values and previous trends between values.

1. Open the Model page of the Forecast editor.
2. Click Add.
   The Forecast model selection page of the Add Model wizard opens.
3. Click Double exponential smoothing and then click Next.
   The Double exponential smoothing page of the Add Model wizard opens.
4. Specify a value in the Exponential smoothing constant field.
   The number must be between zero and one. High values give recent periods more weight and low values give more weight to past data.
5. Specify a value in the Trend smoothing constant field.
   The number must be between zero and one. High values give recent trends more weight and low values give more weight to past trends.
6. Click Finish.
   The Add Model wizard closes and the forecast model is displayed in the table.