When we want to do a DoE with 4 different components A, B, C and D and also a few others and we want to vary each component A,B,C,D in a concentration from eg. 20-70 phr but at the same time when A is in the mixture, B,C and D should be absent and vice versa. If I make them categorical I have only 1 at the same time but then I can’t choose the concentration and if I make it continuous I can’t choose between them. Has someone a better option?
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