Example of ROC Curves

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Basic Analysis • Logistic Analysis • Additional Examples of Logistic Regression • Example of ROC Curves

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To demonstrate ROC curves, proceed as follows:

Select Help > Sample Data Library and open Penicillin.jmp.

Select Analyze > Fit Y by X.

Select Response and click Y, Response.

Select In (dose) and click X, Factor.

Notice that JMP automatically fills in Count for Freq. Count was previously assigned the role of Freq.

Click OK.

From the red triangle menu, select ROC Curve.

Select Cured as the positive, and click OK.

Note: This example shows a ROC Curve for a nominal response. For details about ordinal ROC curves, see ROC Curve in the Predictive and Specialized Modeling book.

The results for the response by In (dose) example are shown here. The ROC curve plots the probabilities described above, for predicting response. Note that in the ROC Table, the row with the highest Sens-(1-Spec) is marked with an asterisk.

Figure 7.122 Examples of ROC Curve and Table

Since the ROC curve is well above a diagonal line, you conclude that the model has good predictive ability.

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Help created on 7/12/2018