After Predictor determines the method that best fits the historical data, it can use that same method to forecast future values. You need to decide how many time periods to forecast.
Consider these factors:
The first few values are fairly reliable. Forecast only as many values as you need.
The farther out you try to forecast, the less reliable the forecasted values are. The confidence interval of any forecast grows to reflect this decrease in reliability.
To indicate how many time periods to forecast, enter the number in