In a single exponential smoothing model,finding the forecast value for each period requires having the actual and forecast values from the proceeding period.This is not possible for the first period,so for the first period one should use the actual value as the forecast value.

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Quizplus · Accepted Answer

This is because there is no preceding period for the first period, so the actual value is used as the forecast value.

In a Single Exponential Smoothing Model,finding the Forecast Value for Each