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Fitting Linear Models > Stepwise Regression Models > The All Possible Models Option > Example Using the All Possible Models Option
Publication date: 11/10/2021

Example Using the All Possible Models Option

1. Select Help > Sample Data Library and open

2. Select Analyze > Fit Model.

3. Select Oxy and click Y.

4. Select Runtime, RunPulse, RstPulse, and MaxPulse and click Add.

5. For Personality, select Stepwise.

6. Click Run.

7. Click the Stepwise red triangle menu and select All Possible Models.

8. Enter 3 for the maximum number of terms, and enter 5 for the number of best models.

Figure 5.23 All Possible Models Pop-up Dialog 

All Possible Models Pop-up Dialog

9. Click OK.

All possible models (up to three terms in a model) are fit.

Figure 5.24 All Possible Models Report 

All Possible Models Report

The models are listed in increasing order of the number of parameters that they contain. The model with the highest R2 for each number of parameters is highlighted. The radio button column at the right of the table enables you to select one model at a time and check the results.

Note: The recommended criterion for selecting a model is to choose the one corresponding to the smallest BIC or AICc value. Some analysts also want to see the Cp statistic. Mallow’s Cp statistic is computed, but initially hidden in the table. To make it visible, right-click in the table and select Columns > Cp.

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