What do i do when I get ' * ' for my p-values in minitab 17?

Abinaya Arunachalam @Abinaya_Arunachalam

04 April 2017 1 3K Report

When I carry out ANOVA on my experimental data ( 3 factors, 2 levels) , I'm getting " * " for all my p and f values in minitab 17. Can someone give a clear procedure as to what should be modified?

This is one of the papers I'm following but they have used minitab 15. I tried replicating their data in minitab and again got " * ". What's wrong?

Article Factorial Experimental Design for Biosorption of Iron and Zi...

Raid Amin

Try leaving out the full interaction ABCD. In fractional factorial designs we often have to leave out some of the higher order interactions.

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