The Optimal mixture design choice invokes the custom designer with the mixture variables entered into the response and factors panels. To create an optimal mixture design:
Select DOE > Mixture Design.
Click Optimal on the Choose Mixture Design Type panel.
Open the Define Factor Constraints node and click Add Constraint to add linear constraints, if you have any.
In the Design Generation panel, make selections relative to blocks, center points, replicates, and the number of runs.
Click Make Design to generate the Mixture Design report, which displays the design and Design Evaluation report.
Click Make Table in the Output Options panel of the Mixture Design report to generate the data table.
The Model Panel
To add interaction terms to a model, click the Interactions button and select 2nd, 3rd, 4th, or 5th. For example, if you have factors X1 and X2, click Interactions > 2nd and X1*X2 is added to the list of model effects.
To add powers of continuous factors to the model, click the Powers button and select 2nd, 3rd, 4th, or 5th.
When you want a mixture model with third-degree polynomial terms, the Scheffé Cubic button provides a polynomial specification of the surface by adding terms of the form X1*X2*(X1-X2).