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Demand forecasting: procedure of Winters

The forecasting procedure of Winters for trend and seasonal demand is applied. Initial value for the seasonal factors may be computed with the help of the module time series analysis.

Initial values can be computed in the module Time series analysis.


Alpha smoothing constant for the base level
Beta smoothing constant for the slope
Gamma smoothing constant for the seasonal indices
b0(t) base level of the tren line in period t
b1(t) slope of the trend line in period t
s(j) seasonal factor for seasonal period j
Y(t) observed demand in period t
P(t) forecasted demand for period t


- Tempelmeier (2005)

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