DOE with covariate
I have done some basic searching already, but can't find an example matching this scenario. Suppose I wanted to run a typical full or fractional 2-level factorial DOE but there was a covariate I wanted to account for. I was expecting that I could just go to custom design and add the factors and specify one of those as a covariate. It would make the table and fill in the +1 -1 as appropriate for th...