Regression

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by DSK » Sun Oct 11, 2020 5:23 am

I feel like I must be overlooking something obvious, but I'm doing a regression and I have a variable (group) with 3 levels. In the model coefficients, it shows a comparison of group 2-1 and group 3-1, but not group 3-2. Can you tell me why I don't need that comparison or, if I do, how to get it? Thanks very much.

PS-Jamovi is great. It would be a pain to try to use SPSS remotely.
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by jonathon » Sun Oct 11, 2020 5:33 am

yeah, unfortunately i think the answer is "that's just how linear models work".

you have a reference level, and everything is compared to that reference level.

you could do an ANOVA and perform post-hoc tests, if that's the sort of testing you're wanting to do.

i'm not really an expert here, so hopefully someone else will chime in.

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by DSK » Mon Oct 12, 2020 12:11 am

Jonathon,

Thanks very much for your fast reply. (I'm used to using ANOVA, so I just expected it would be the same, but now I see your point.) Actually, now that I know there's nothing wrong, I think I can work with that. Thank you again for creating Jamovi!

Doug
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