I am doing ANOVA for three factors with different levels, and the ANOVA table has only two factors out of three. I am wondering why did it happen and what should I do. Should I consider the removed factor as insignificant?
Any answer is appreciated.
Hello Mahmoud,
Without knowing a little more about your data set and the command you used to elicit the analysis, I can only offer some suggestions that might trigger such a message:
1. You have no variation on the factor in question (e.g., all cases are of one level of that factor);
2. Your sample size was insufficient in one or more cells.
Good luck with your work!
In completing David's comment Are you sure that your third factor is not built on two other factors. Minitab is a great software and there is no possibility of mistakes. My other idea is to use DOE instead of GLM.
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