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- Problem with Parameter Estimates in a Regression Interaction

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May 27, 2017 11:15 PM
(3680 views)

Hello! I am having difficulty looking into what drives an interaction I have found. The interaction is between Age and Group. Since Age is a continuous variable, I have used a regression to look into it. I would like to do individual t-tests within the regression to see what is driving the interaction. I believe this would be under the "Parameter Estimates" section of the report.

However, for whatever reason, JMP does not include all three groups in the Parameter Estimates. It always seems to leave out a group. I tried the model with groups A, B, and C, and it gave me estimates for A and B. When I tried it with just groups B and C, it only gave me estimates for B. And when I tried groups A and C, it again only gave me estimates for A. Why is this? Can anybody help me? Thank you!

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- Tags:
- jmp_12
- regression

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Re: Problem with Parameter Estimates in a Regression Interaction

That was exactly what I was looking for. Thank you so much for the help and the explanation!