Hello,
I have some categorical factors which are related to some continuous factors, In Minitab software when I use every type of design I see that factors are independent completely. for example If my salt concentration be zero, and salt type change in design, every effect of salt type is wrong, because I didn't add any of those salts at all. How can I introduce related factor as related factors to Minitab or every DOE software?
Thanks a lot
I am not sure I understand your question. By factors do you mean categorical variables? Or some ordinal variables obtained by discretizing a continuous variable?
The entire idea of Design of Experiments is to keep all the variables independent from each other. If you have 2 salts to test, you can keep them as independent variables and just interpret Salt A at 0.0M and Salt B at 0.0M as a baseline. The fact they both test the same thing can give you an idea about the reproduciblity of the test.
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