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Stepwise - Whole Effects rule --> Model launch does not include terms to maintain heredity

wendytseng

When I have categorical factors with more than 2 levels, I use Whole Effects but then when I go to launch the Fit Model dialogue...I run into issues where my lower order terms are not included. It does not demo well to have to add all of them back in.

What are others doing? What am I missing here?

Accepted answers

jiancao

Whole Effects rule doesn't maintain the model hierarchy; only the Combine and Restrict rules do. Do not know why JMP won't enforce it with the whole effects rule.

All comments

jiancao

Can you post a screenshot of what happened?

wendytseng

Attached is the data table with the Stepwise model script and screens hot below when you go to Fit Model. stepwise heredity violated.jpg

Tablet Production - Stepwise Demo.jmp

jiancao

Whole Effects rule doesn't maintain the model hierarchy; only the Combine and Restrict rules do. Do not know why JMP won't enforce it with the whole effects rule.

wendytseng

Thanks, Jian! I have always wondered why this is the case. It is very clunky in my view and does not demo well.