|Degree||Number of blends|
|1||Contains only vertex points.|
|2||Contains double blends where the components are mixed equally.|
|3||Two double blends for each pair of components and triple blends that are mixed equally.|
|4||Three double blends for each pair of components and two triple blends for each trio of components.|
Select this option to include a point in the center of the design space. Center points have multiple uses. Designs with process variables or replicates increase the number of center points in the final design. For more information on augmentation, go to How Minitab augments mixtures designs by adding center points.
Select this option to include 1 axial point per component in the base design. An axial point is a blend where the component proportions are the average of the center point and a vertex. A design with these interior points provides more information about the inner portion of the response surface to model more complicated curvature. For diagrams that show examples of unaugmented and augmented simplex designs with three components, go to Choose a mixture design.
For simplex lattice designs and extreme vertices designs, replication of blend points adds experimental runs only if the degree of the design includes the blend in the base design.