Model Browser User's Guide

Starting the Design Editor

Setting Up a Model

You must first have a model for which to design an experiment.

1. From the Model Browser at startup, click the  button in the toolbar, or click New in the Test Plans pane, or choose File -> New Test Plan.
2. Select Two-Stage Model and click OK.
3. Click the new Two-Stage node that appears in the model tree (in the All Models pane), or double-click Two Stage in the Test Plans list at the bottom. The Two-Stage Model diagram appears.

If you already have a project open, you can select any existing model within the test plans in the Model Browser tree. For the purposes of this tutorial, you design experiments for the default Two-Stage global model, which is a quadratic.

There is only one input to the global model by default. To increase the number of input factors:

1. Double-click the Global Model Inputs block in the diagram. The Input Factors Setup dialog appears.
2. Increase the number of factors to three by clicking the Number of Factors up/down buttons or entering 3 in the edit box.
3. Change the symbols of the three input factors to N, L, and A. This matches the global factors modeled in the Quick Start tutorial: speed (n), load (L), and air/fuel ratio (A).
4. Click OK to leave the Input Factor Setup dialog.

Starting the Design Editor

To access the Design Editor use either of the following methods:

• Right-click the global model in the diagram and choose Design Experiment, as shown.
• You can also access the Design Editor by selecting the menu item TestPlan -> Design Experiment.

  

  

1. The Design Editor window appears.

Creating a New Design

1. Click the  button in the toolbar or select File -> New. A new node called Linear Model Design appears.

   

2. The new Linear Model Design node is automatically selected. An empty Design Table appears (see above) because you have not yet chosen a design. For this example you create an optimal design for the default global model, which is a quadratic.

1. You can change the model for which you are designing an experiment from within the Design Editor window by selecting Edit -> Model.

3. Rename the new node Optimal (you can edit the names by clicking again on a node when it is already selected, or by pressing F2, as when selecting to rename in Windows Explorer).

Design Styles

Optimal Designs