Modeling and Multivariate Methods - SAS

428 Performing Choice Modeling Chapter 16
Special Data Rules
Subject Data with Response Data
If you have subject data in the Response data table, just select this table as the Select Data Table under the
Subject Data. In this case, a Subject ID column does not need to be specified. In fact, it is not used. It is
generally assumed that the subject data repeats consistently in multiple runs for each subject.
Logistic Regression
Ordinary logistic regression can be done with the Choice Modeling platform.
Note: The Fit Y by X and Fit Model platforms are more convenient to use than the Choice Modeling
platform for logistic regression modeling. This section is used only to demonstrate that the Choice
Modeling platform can be used for logistic regression, if desired.
If your data are already in the choice-model format, you might want to use the steps given below for logistic
regression analysis. However, three steps are needed:
• Create a trivial Profile data table with a row for each response level.
• Put the explanatory variables into the Response data.
• Specify the Response data table, again, for the Subject data table.
An example of using the Choice Modeling platform for logistic regression follows:
1. Select Analyze > Modeling > Choice > Select Data Table > Other > OK.
2. Open the sample data set Lung Cancer Responses.jmp. Notice this data table has only one column
(Lung Cancer) with two rows (Cancer and NoCancer).
3. Select Lung Cancer as the Profile ID and Add Lung Cancer as the model effect. The Profile Data dialog
box is shown in Figure 16.34.