Crystal Ball uses the following initialization equation for this method:
Set Lt = P, St = Yt/P for t = 1 to s
Crystal Ball uses the following equations to calculate this method:
α—Alpha
γ—Gamma
m—Number of periods ahead to forecast
s—Length of seasonality
Lt—Level of the series at time t
St—Seasonal component at time t
Note: | First fit is available from period (s + 1) |