DOE - editing Custom Design dialogue of an existing table

[#1]

Hello,

I created a DOE table which had a minimum # of runs as 44. The table has 8 factors (7 continuous and 1 discrete) and 3 responses.

However, when I re-enter the DOE dialogue, press "back" and edit my factors something strange happens. Adding a new continuous factor actually decreases the minimum # of runs to 10. How could this be true?

Thanks in advance.

[#2]

The model will change when you change factors (add or remove one). Did you check that all the same terms are present for both designs?

[#3 · Accepted solution]

Hi Mark-

Same terms were indeed present - but I did find the "issue".

I had RSM model selected for an 8-factor design. When I added the 9th factor the model reverted to Main Effects, significantly reducing the number of experiments necessary. I'm brand new to JMP and didn't catch this.

Thanks for your response!

[#4]

So the terms were not the same in both cases. That is what I thought. Glad you learned about JMP behavior in Custom Design.

[#5]

Oh I misunderstood your question - the original 8 terms were the same but I added a new 9th term.

Thanks again!