jamovi

Hello,
I have 2 questions:
1. in a moderating model is there a need to center the variables? or does Jamoovi do it automatically?
2. If I have a categorical moderator (ex. Family Status - 0,1) , does the add-on MEDMODE know how to run the model, or does it only know how to run a moderation model with continuous variables?

Thanks!

> in a moderating model is there a need to center the variables? or does Jamoovi do it automatically?

i'm not sure. you could try centering the variable, and see if it makes any difference. you can use the formula:

variableName - VMEAN(variableName)

cheers

You can use jamovi regression, center your continuous variable as Jonathon showed, put your moderator as "factors", and select "gran mean (simple coding)" in "Reference levels" panel. You add the interaction in the model, and that would give you the results you're looking for.
Alternatively (same results), you can use module GAMLj, set a model with factor and covariate, add the interaction in the model, and you get the correct results. GAMLj centers the variables by default.

Thank You for the answers!
Choosing the second option GAMLj, should I choose General Linear Model?