How do I block for "month" in a 2^(4-1) fractional factorial design?
I have 4 factors & plan on doing 8 runs. I'm wondering if I can block 4 of the runs for the 1 month I run those experiments, and 4 of the runs the next month that I run the experiment - basically 2 blocks of size 4. Would adding month as a blocking factor mean I now have 5 factors in my design? How would that look in a model & what would that alias structure look like? Somewhat related - I'd like...