jamovi

I am writing currently my master thesis and using Jamovi for the statistic part.

I want to do a moderation and also a mediation analysis with medmod. But I was wondering if I need to do mean center the predictor beforehand?
Do you have any general guideline how medmod works and are the results similar to SPSS?

Thanks for help

I'm almost certain that medmod automatically centers for moderation. I ran moderation analyses using medmod then using PROCESS on SPSS (on SPSS choosing center all variables in PROCESS) virtually identical results as in jamovi.

HAP wrote:I'm almost certain that medmod automatically centers for moderation.

Hey @HAP,
if you take a look at the code here:
https://github.com/raviselker/medmod/bl ... /R/utils.R
it's here
https://github.com/raviselker/medmod/bl ... #L198-L201

you can eliminate the almost!

Cheers,
Maurizio