Define Custom Split-Plot Design

Stat > DOE > Factorial > Define Custom Factorial Design

Complete the following steps to specify which columns are the factors in the design.

  1. In Factors, enter the columns that contain the factor settings for each experimental run.
  2. Select 2-level split-plot (hard-to-change factors).
  3. In Factors from above that are hard to change, enter the factors that stay the same for entire whole plots.
  4. Click Low/High. Minitab will not define the design before you review the low and high levels of the factors.

In this worksheet, Stain is an easy-to-change factor that changes within the same whole plot. Pretreatment is a hard-to-change factor that stays the same for an entire whole plot.

In this worksheet, whole plots are built from the levels of Pretreatment. When Pretreatment changes, a new whole plot begins. If you do not have a column that identifies whole plots, you must specify a single size for all of the whole plots when you click Designs.

The columns Standard Order, Run Order, Blocks, and Point Type contain optional information that you can specify if the information is in the worksheet.

C1 C2 C3 C4 C5 C6 C7
Stain Pretreatment Whole Plots Standard Order Run Order Blocks Point Type
A A 1 7 1 2 1
B A 1 8 2 2 1
A B 2 4 3 2 1
B B 2 3 4 2 1
A A 3 9 5 2 1
B A 3 10 6 2 1