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Dec 5, 2017 1:26 PM
(3075 views)

I'm doing a stepwise regression to study the effect of some parameters on salaries. So:

Dependent variable is: salary

Independent variable are: gender, yrs_in_rank, URM_NonURM, Professor, AssociateProfessor, Assistant Professor, Instructor, and Lecturer (Professor, associate Professor, Assistant Professor, Instructor and Lecture are the five ranks of the study pool, they are recoded as dummy variable based one source column)

When I try to enter the above parameters, most parameters are entered except Lecturer. In fact, I can only enter four out of five ranks. I dont know why. I suspect it might be due to collinearity, but how could JMP know they are collinear variable? Is there a way I could enter all of five ranks into the analysis?

Thank you!

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Re: Cannot enter a parament for JMP stepwise regression

Thank you dale_lehman for your very clear explanation. I understand and agree what you said about why the 5th variable cannot be entered. I understand statistically it doesn’t make sense to include the 5th variable if it can be linearly explained by the other 4. I'm still having trouble to explain the effect of 5th variable, in this case, it's the effect of lecturer rank. Can you give me some suggestions how to interpret this regression results, especially the effect of rank lecturer? Any advice/comment/suggestion would be much appreciated.

Also I tried to expand the estimates, it shows expanded results for selected parameter, and the 5th variables’ estimate still missing.

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Re: Cannot enter a parament for JMP stepwise regression

Thanks a lot dale_lehman. Now I understand and know how to do it.

Very appreciate it! Thanks again.