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DOE - editing Custom Design dialogue of an existing table

dbu

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.

Accepted answers

dbu

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!

All comments

Mark_Bailey

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?

dbu

Hi Mark-

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

Thanks for your response!

Mark_Bailey

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

dbu

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

Thanks again!