Messages about the number of corner points in a power and sample size calculation

You might see the following messages in Minitab when using Stat > Power and Sample Size > 2-Level Factorial Design:

* ERROR * Number of corner points <= number of factors
* ERROR * Maximum number of corner points = 128

The only factorial designs for which you can calculate power and sample size in Minitab are those that you can create using Stat > DOE > Factorial > Create Factorial Design, with the exception of 2-level split-plot designs.

For example, you can't calculate power and sample size for a design with 9 factors and 8 corner points (because it has more factors than runs) or a design with more than 128 corner points.

For assistance in selecting an available factorial design, choose Stat > DOE > Factorial > Create Factorial Design, select 2-level factorial (default generators) or Plackett-Burman design and click Display Available Designs. This dialog box does not take any input, but displays a table that shows available factorial designs, based on:

the number of factors of interest
the number of runs you can do
the resolution of the design that you want

You can only calculate power and sample size for designs that Minitab displays in these tables.