Hello,
I have done a half-factorial screening with 4 factors, and now would like to augment the design to include the rest of the missing 2-way interactions and axial points to check for quadratics.
When I use the DOE -> Augment Design ->Augment-> RSM and 2nd interactions, the number of suggested runs is always 18 (10 previous runs and 8 new runs as the augmented design) , however, the actual runs change every time that I try these same steps. I have two examples pasted below. I'd like to know why does this happens and why the runs change.
And my second question is regarding the "weird" non-Integer values suggested by JMP (56.6 and 57.2 in the tables below - the range for that factor has been set to 50-70). Why does JMP require a run at these specific values instead of the mid point which in this case will be 60? Is this related to the optimality criteria (D-optimal vs I-optimal)?
Thank you in advance!
