Error analysis for Winters' Additive Seasonal Forecasting System
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A procedure for deriving the variance of the forecast error for Winters' Additive Seasonal Forecasting system is given. Both point and cumulative T-step ahead forecasts are dealt with. Closed form expressions are given in the cases when the model is (i) trend-free and (ii) non-seasonal. The effects of renormal ization of the seasonal factors is also discussed. The fact that the error variance for this system can be infinite is discussed and the relationship of this property with the stability of the system indicated. Some recommendations are given about what to do in these circumstances.
NPS Report NumberNPS55-84-005
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