Single Exponential Smoothing Method:

Since single exponential smoothing method is an one period ahead forcaster, we modified it and used the actual demand of the most recently known period (e.g., period 12 in our database) for future periods' (14 and after) forecast.

Double Exponential Smoothing Method:

Similar to single exponential smoothing method, the double exponential smoothing method is an one period ahead forecast, we used the last known period's a and b values for future periods' (14 and after) forecast.

Triple Exponential Smoothing Method:

Where:

• Xt is the actual demand for period t.
• Ft is the forecast demand for period t.
• Alpha is the smoothing coefficient.
• k is the number of periods ahead forecast.

Reference:

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