Your experiment has 4 factors (A, B, C, D) and each one consumes 2 DF with a total of 8 DF. Then, MSE could not be calculated and it's necessary for calculating the statistics tests (P and F).
Licht is correct. I recommend removing factor A from your model. This will free up 2 df for the error term. I recommend using factor A because is has the smallest effect of the 4 factors on the S/N Ratios.
Licht is correct. I recommend removing factor A from your model. This will free up 2 df for the error term. I recommend using factor A because is has the smallest effect of the 4 factors on the S/N Ratios.
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