Effect Heredity Example

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Design of Experiments Guide • The Fit Two Level Screening Platform • Additional Fit Two Level Screening Analysis Examples • Effect Heredity Example

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This example illustrates building a model when the Fit Two Level Screening platform identifies a model that does not follow effect heredity.

Select Help > Sample Data Library and open Design Experiment/Plackett-Burman.jmp.

Select Analyze > Specialized Modeling > Specialized DOE Models > Fit Two Level Screening.

Select Percent Reacted and click Y.

Select Feed Rate through Concentration and click X.

Click OK.

Figure 9.7 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.

Click Make Model.

Select Stir Rate and click Add in the Construct Model Effects section.

Click Run.

Figure 9.8 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.

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Help created on 10/11/2018