The data file Quarterly Sales shows quarterly sales of a corporation over a period of 6 years. Use the Holt-Winters seasonal method to obtain forecasts of sales up to eight quarters ahead. Employ smoothing constants α = 0.5, β = 0.6, and γ = 0.7. Graph the data and the forecasts.
Answer to relevant QuestionsUsing the data in the data file Earnings per Share, estimate a first-order autoregressive model for the earnings per share. Use the fitted model to obtain forecasts for the next 4 days. For a certain product it was found that annual sales volume could be well described by a third-order autoregressive model. The estimated model obtained was as follows: xt = 202 + 1.10xt-1 – 0.48xt-2 + 0.17xt-3 + εt For ...Refer to the data file Quarterly Earnings. Use the Holt-Winters seasonal method with smoothing constants α = 0.6, β = 0.6, and γ = 0.8 to obtain forecasts of this earnings-per-share series for the next four quarters. The data file Housing Starts shows private housing units started per thousand of population in the United States over a period of 24 years. Compute a simple, centered 5-point moving average series for the housing starts ...Refer to the data of Example 17.2. If a total sample of 100 colleges is to be taken, determine how many of these should be 4-year schools under each of the following schemes. a. Proportional allocation b. Optimum allocation, ...
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