If you used “Stat>DOE>Factorial>Analyze Factorial Design”, next look at “Stat>DOE>Factorial>Factorial Plots and look at your main effects & interations to see if the middle setting on your 3 level factor shows up. Just because you have the data in the worksheet, does not mean minitab did not ignore it. But if you have a balance design you can get more info/graphs with the DOE analysis.Ģ. Did you use “Stat>DOE>Factorial>Analyze Factorial Design”? or “Stat>ANNOVA>General Linear Model”? It will always use 3 levels with GLM.
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