Design of Experiments Guide  • Mixture Designs • Examples of Mixture Design Types • Simplex Centroid Design
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Simplex Centroid Design
A simplex centroid design of degree k with n factors consists of mixtures with the following characteristics:
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all one factor mixtures or pure blends
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all blends of two factors at equal levels
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additional blends, up to k factors at a time blended at k equal levels
A center point run with equal amounts of all the ingredients is always included.
Creating the Design
To create an example simplex centroid design:
1.
Select DOE > Classical > Mixture Design.
2.
Use three factors for this example. No changes need to be made to the Factors section.
3.
Click Continue.
4.
Click Simplex Centroid to generate the design
Note: The default setting of k = 2 was used. There is a text box that enables you to adjust the value of k.
Figure 12.8 Three Factor Simplex Centroid Design of Degree 2.
5.
Click Make Table.
Visualize the Design
6.
From design table, select Graph>Ternary Plot.
7.
Select X1, X2, and X3 and click X, Plotting, and then click OK.
Figure 12.9 Ternary Plot for Simplex Centroid Design
For details about ternary plots see Ternary Plot Overview.

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Help created on 7/12/2018