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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 209<br />

Logistic Fit Platform Options<br />

6. Click OK.<br />

The cumulative logistic probability plot shows the result.<br />

Figure 7.11 Logistic Probability Plot<br />

Note that the fitted curve crosses the 0.9 probability level at a heat level of about 39.5, which is the inverse<br />

prediction. To be more precise <strong>and</strong> to get a fiducial confidence interval:<br />

7. From the red triangle menu next to Logistic Fit, select Inverse Prediction.<br />

8. For Probability, type 0.9.<br />

9. Click OK.<br />

The predicted value (inverse prediction) for heat is 39.8775, as shown in Figure 7.12.

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