F fofooo New member Jan 21, 2011 #1 I have 4 factors each with 4 variables and I need the program to design the experiment for me, that is what are the combinations, also what does 1, -1 mean?
I have 4 factors each with 4 variables and I need the program to design the experiment for me, that is what are the combinations, also what does 1, -1 mean?
