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Basic Analysis > Logistic Analysis > Additional Examples of Logistic Regression > Example of Inverse Prediction Using the Inverse Prediction Option
Publication date: 11/10/2021

Example of Inverse Prediction Using the Inverse Prediction Option

If your response has exactly two levels, the Inverse Prediction option enables you to request an exact inverse prediction. You are given the x value corresponding to a given probability of the target category, as well as a confidence interval for that x value.

1. Select Help > Sample Data Library and open

2. Select Analyze > Fit Y by X.

3. Select Response and click Y, Response.

4. Select ln(dose) and click X, Factor.

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

5. From the Target Level list, select Cured.

6. Click OK.

7. Click the red triangle next to Logistic Fit of Response By ln(dose) and select Inverse Prediction (Figure 8.11).

8. Type 0.95 for the Confidence Level.

9. Select Two sided for the confidence interval.

10. Request the response probability of interest. Type 0.5 and 0.9 for this example, which indicates you are requesting the values for ln(dose) that correspond to a 0.5 and 0.9 probability of being cured.

Figure 8.11 Inverse Prediction Window 

Inverse Prediction Window

11. Click OK.

The Inverse Prediction plot appears.

Figure 8.12 Example of Inverse Prediction Plot 

Example of Inverse Prediction Plot

The estimates of the x values and the confidence intervals are shown in the report as well as in the probability plot. For example, the value of ln(dose) that results in a 90% probability of being cured is estimated to be between -0.526 and 0.783.

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