Model Browser User's Guide

Design Evaluation Tool

The Design Evaluation Tool is only available for linear models. See also Global Model Class: Multiple Linear Models.

1. Return to the Design Editor and select Tools -> Evaluate Designs.
2. Choose the Box-Behnken design and click OK in the Select Designs dialog.

1. The Design Evaluation Tool displays a large amount of statistical information about the design.

3. Select Hat Matrix from the list on the right.
4. Click the Leverage Values button.

1. Note that the leverage of the central point is 1.00 (in red) and the leverage of all other points is less than this. The design would clearly be strengthened by the addition of more central points. Obviously this is a special case, but for any kind of design the Design Evaluation Tool is a powerful way to examine properties of designs.

5. Select Design Matrix from the list box.
6. Click the 3D Surface button in the toolbar.

   

This illustrates the spherical nature of the current design. As usual, you can rotate the plot by clicking and dragging with the mouse.

There are many other display options to try in the toolbar, and in-depth details of the model terms and design matrices can all be viewed. You can export any of these to the workspace or a .mat file using the Export box.

For a description of all the information available here, see Design Evaluation Tool.

Classical Design Browser

Improving the Design