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The model you choose determines what terms are fit and whether or not you can model linear or curvilinear aspects of the response surface. If you include any second-order terms (squares or interactions), you can model curvilinear data.
To save time in model specification, you can choose a model type in the Terms sub-dialog box so that Minitab fits a certain set of terms. The following table shows what terms Minitab fits for each model type.
| Model type | Terms |
|---|---|
| Linear | A B C D |
| Linear and squares | A B C D A*A B*B C*C D*D |
| Linear and 2-way interactions | A B C D A*B A*C A*D B*C B*D C*D |
| Full quadratic (default) | A B C D A*A B*B C*C D*D A*B A*C A*D B*C B*D C*D |
You can add or remove terms from any of these sets to specify the exact model that you want.
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