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Modeling and Multivariate Methods - SAS

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Chapter 7 Performing Logistic Regression on Nominal <strong>and</strong> Ordinal Responses 217<br />

Example of a Nominal Logistic Model<br />

Figure 7.18 A Two-factor Factorial Model with Nominal Response<br />

The Whole Model Test table shows that the two-factor model fits as well as the three-factor model. In fact,<br />

the three-factor Whole Model table in Figure 7.19 shows a larger Chi-square value (32.83) than the<br />

Chi-square value for the two-factor model (27.17). This results from the change in degrees of freedom used<br />

to compute the Chi-square values <strong>and</strong> their probabilities.

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