Multi-Period Forecasting with Trend

Using Holt s method for trend (Section 2.6.2), forecasts for multiple periods are given by 

Consider Example 2.5, where Holt s method was used to forecast demand for month 7, based on the actual demands for the first 6 months. Determine the forecast of demands for months 7,8, and 9. 

In the solution to Example 2.5 (Table 2.6), the latest estimates of level and trend for month 7 were computed as 

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Multi-Period Forecasting with Seasonality and Trend... 

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