DOE blocking and a confounding factor
Ok. So, I have an experiment with 5 (five) 2-level factors, F1, F2...F5. An additional variable, not of direct interest, was a hard-to-change factor that called for a (blocking) variable F6 that essentially divided the experiment into 2 separate 1-week blocks. That's because one of our participant groups had to divide their participation into one week or the other, and we wanted to block for that...