Specify the design for Create Response Surface Design (Box-Behnken)

Stat > DOE > Response Surface > Create Response Surface Design > Designs

In This Topic

Number of center points
Number of blocks
Number of replicates

Number of center points

Select the number of center points for the base design. Center points are experimental runs where all of the factors are set midway between their low and high levels. Each replicate of the design adds the same number of center points. Each level of a categorical factor also adds the same number of center points.

Default: Select this option to have Minitab Statistical Software determine the number of center points based on the number of continuous factors.
Custom: Select this option to specify the number of center points in the base design.

Number of blocks

Select the number of blocks for the base design. If you have multiple replicates in separate blocks, the total number of blocks is the product of the number of blocks in the base design and the number of replicates. For more information on how Minitab blocks Box-Behnken designs, go to Blocks in a Box-Behnken design.

Number of replicates

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 Stat > DOE > Modify Design. For more information on replicates, go to Replicates and repeats in designed experiments.

Block on replicates: Select whether to put each replicate in its own block. If the base design has blocks, then the total number of blocks is the product of the number of blocks in the base design and the number of replicates.