Medmod

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Mercy93
Posts: 1
Joined: Thu Jun 30, 2022 6:26 am

Medmod

Post by Mercy93 »

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 :)
HAP
Posts: 4
Joined: Tue May 14, 2019 10:23 pm

Re: Medmod

Post by HAP »

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.
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MAgojam
Posts: 421
Joined: Thu Jun 08, 2017 2:33 pm
Location: Parma (Italy)

Re: Medmod

Post by MAgojam »

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
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