Select the number of experimental runs and the number of blocks for the base design. The number of experimental runs in the design also depends on the number of center points, the number of replicates, and the number of categorical factor levels. For more information on how Minitab blocks central composite designs, go to Blocks in a central composite design.
Select the distance, in coded units, of each axial point from the center. For more information on alpha, go to Alpha.
A value of F0.25 guarantees rotatability. F is the number of factorial points in the design.
Enter how many times to perform each experimental run that is in the base design. Usually, you consider the available resources and the purpose of your design when you select the number of replicates. You can add replicates to your design later with . For more information on replicates, go to Replicates and repeats in designed experiments.