Mixture Designs - Simplex Centroid
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Stat > DOE > Mixture > Create Mixture Design > choose Simplex centroid > Designs

Generates settings for the components in an experiment with a simplex centroid design. You can

·    add axial points to the interior of the design (by default, Minitab adds these points to the design)

·    replicate the design

Dialog box items

Augment the design with axial points: Check to augment (or adds points to) the base design. See Placement of axial points in augmented designs.

Replicate Design Points

Number of replicates for the whole design: Choose to replicate the whole design, then choose a number of to 50 for the number of replicates.

Number of replicates for the selected types of points: Choose to replicate only certain types of design points from the base design. Then, under Number, enter the number of replicates for each point type.