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Select Analyze > Specialized Modeling > Specialized DOE Models > Fit Two Level Screening.
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Click OK.
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Figure 10.7 Model Contrasts
TheCatalyst*Stir Rate interaction is highlighted, but the Stir Rate main effect is not. In accordance with the principle of Effect Heredity, you should add the Stir Rate main effect to the model. See Effect Heredity in Starting Out with DOE.
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Click Make Model.
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Click Run.
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Figure 10.8 Partial Fit Model Report
The ^ symbol to the right of the PValue for Stir Rate and Temperature show that while not significant, these effects are contained in significant higher-order effect.