Multi-Period Forecasting with Seasonality and Trend

4 Multi-Period Forecasting with Seasonality and Trend 

Using Winters method to incorporate seasonality and trend (Section 2.7.2), forecasts for multiple periods are given by 

Note that the latest estimates of level, trend, and seasonality indices are used in Equation 2.19. 

Consider Example 2.7 where Winters method was used to forecast the demand for the first quarter of 2011. Determine the demand forecasts all four quarters of 2011. 

In Example 2.7 (Table 2.8), the latest estimates for level (L13), trend (T, and seasonality index (Sh were computed as 

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