Hierarchy

> Non-Hierarchical Model Specified >Hierarchy

> Non-Hierarchical Model Specified >Use to allow Minitab to add the displayed terms to the model in order to create a hierarchical model. In a hierarchical model, all lower-order terms that comprise the higher-order terms also appear in the model. For example, a model that includes the interaction term A*B*C must also include the terms: A, B, C, A*B, A*C, and B*C to be hierarchical.

Usually, you select, improve, and augment designs with a hierarchical model so that you can produce an equation in uncoded (or natural) units. An optimal design that you produce from a non-hierarchical model might not have all the experimental runs to fit a hierarchical model. However, you can evaluate the D-optimality of a non-hierarchical model.

- Would you like Minitab to make your model hierarchical?
- Specify whether Minitab adds terms to the model.
- Add terms to make the model hierarchical (recommended): Minitab will add the displayed terms to produce a hierarchical model.
- Use the specified non-hierarchical model: Minitab will not add the terms.

- Use this choice from now on
- Select to make your choice the default. You will skip this dialog in the future. If you check this option, you can change the setting in .