Time series smoothing Double Exponential Smoothing
SAt = aAt + (1 - a)(SAt-1+ Tt-1)
Where SAt is the smoothed average “base” at period “t” and Tt-1 is the latest estimate of the smoothed average trend
Tt = b(SAt - SAt-1) + (1 - b)Tt-1 Where Tt is the latest estimate of the trend
The forecast for p periods beyond the most recent period is: Ft+p = SAt + pTt