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geomb
geomb
Level I

Ordinal Regression Help

Created: Nov 16, 2022 04:10 PM  |  Last Modified: Jun 10, 2023 1:53 PM (546 views)

Hi, 

 

I was wondering if there was a way to specify the comparison between variables with ordinal regression. I have my ordinal variable (OHI) compared to 3 different bones (femur, ilium, and rib). Based on the output, JMP is comparing the rib to the femur, and the rib to the ilium. Is there a way that I can also compare the femur to the ilium? 

 

Here is the output: 

geomb_0-1668632724971.png

 

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1 REPLY 1
Mark_Bailey
Staff Mark_Bailey
Staff

Re: Ordinal Regression Help

Nov 17, 2022 07:51 AM (528 views)  |  Posted in reply to message from geomb 11-16-2022

The last level is not explicitly shown because it is completely dependent on the other two levels. Ordinal regression models the log odds against the linear predictor, or Bone in your case. It uses cumulative odds, so only separate intercepts are needed for each level of OHI. A common fixed effect for each level of Bone but the last level suffices. So the only comparisons that are possible are from each level to the last level. JMP automatically orders the levels alphabetically. So the first level is the femur, the second level is the ilium, and the last level is the rib.

 

You might use the Profiler to compare the effects of each level of Bone.

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