TAILIEUCHUNG - SAS/ETS 9.22 User's Guide 275

SAS/Ets User's Guide 275. Provides detailed reference material for using SAS/ETS software and guides you through the analysis and forecasting of features such as univariate and multivariate time series, cross-sectional time series, seasonal adjustments, multiequational nonlinear models, discrete choice models, limited dependent variable models, portfolio analysis, and generation of financial reports, with introductory and advanced examples for each procedure. You can also find complete information about two easy-to-use point-and-click applications: the Time Series Forecasting System, for automatic and interactive time series modeling and forecasting, and the Investment Analysis System, for time-value of money analysis of a variety of investments | 2732 F Chapter 42 Choosing the Best Forecasting Model Now bring up the Model Selection Criterion window again and select Akaike Information Criterion. This statistic puts a lesser penalty on number of parameters and the Airline Model comes out as the better fitting model. Sorting and Selecting Models Select Sort Models on the Tools menu or from the toolbar. This sorts the current list of fitted models by the current selection criterion. Although some selection criteria assign larger values to better fitting models for example R-square while others assign smaller values to better fitting models Sort Models always orders models with the best fitting model in this case the Airline Model at the top of the list. When you select a model in the table its name and criterion value become highlighted and actions that apply to that model become available. If your system supports a right mouse button you can click it to invoke a pop-up menu as shown in Figure . Figure Right Mouse Button Pop-up Menu Comparing Models F 2733 Whether or not you have a right mouse button the same choices are available under Edit and View from the menu bar. If the model viewer has been invoked it is automatically updated to show the selected model unless you have unlinked the viewer by using the Link Unlink toolbar button. Select the highlighted model in the table again. Notice that it is no longer highlighted. When no models are highlighted the right mouse button pop-up menu changes and items on the menu bar that apply to a selected model become unavailable. For example you can choose Edit from the menu bar but you can t choose the Edit Model or Delete Model selections unless you have highlighted a model in the table. When you select the check box in the Forecast Model column of the table the model in that row becomes the forecasting model. This is the model that will be used the next time forecasts are generated by choosing View Forecasts or by using the Produce Forecasts window. Note .

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