[R-meta] Testing multicollinearity between categorical predictors

Rafael Rios b|or@|@e|rm @end|ng |rom gm@||@com
Fri Jun 19 14:36:36 CEST 2020

Dear Wolfgang,

Thank you for the replay. I also thought about using VIF to evaluate
multicollinearity, but there is a lot of criticism about the applicability
of VIF for categorical predictors. There is a variation called GVIF.
However, since the meta-analysis changes categorical predictors to dummy
variables, I could not use it in R. I am not sure whether this is the best
approach. Do you not other methods to evaluate or avoid potential
multicollinearity among categorical moderators?

Best wishes,


*Prof. Dr. Rafael Rios Moura*

*sciencia amabilis *
Coordenador de Pesquisa e do NEPEE/CNPq
Laboratório de Ecologia e Zoologia (LEZ)
UEMG - Unidade Ituiutaba

ORCID: http://orcid.org/0000-0002-7911-4734
Currículo Lattes: http://lattes.cnpq.br/4264357546465157
<http://lattes.cnpq.br/4264357546465157>Research Gate:
Rios de Ciência: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg

Em sex., 19 de jun. de 2020 às 05:40, Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer using maastrichtuniversity.nl> escreveu:

> Dear Rafael,
> I don't know what "testing" for multicollinearity would entail. One could
> examine the variance inflation factors with vif(). What VIF values are
> considered "large" is debatable though.
> Best,
> Wolfgang
> >-----Original Message-----
> >From: Rafael Rios [mailto:biorafaelrm using gmail.com]
> >Sent: Wednesday, 17 June, 2020 2:28
> >To: Viechtbauer, Wolfgang (SP); r-sig-meta-analysis using r-project.org
> >Subject: Testing multicollinearity between categorical predictors
> >
> >Dear Wolfgang and All,
> >
> >Is there a good method for testing multicollinearity between categorical
> >predictors in meta-regression? I ran a mixed-effects MLMA using two
> >categorical predictors and their interaction as moderators, but a Referee
> >requested a test of multicollinearity. I did not find a good approach to
> >solve this problem. Thank you in advance.
> >
> >Best wishes,
> >_______________________________________________________
> >
> >Prof. Dr. Rafael Rios Moura
> >sciencia amabilis
> >Coordenador de Pesquisa e do NEPEE/CNPq
> >Laboratório de Ecologia e Zoologia (LEZ)
> >UEMG - Unidade Ituiutaba
> >
> >ORCID: http://orcid.org/0000-0002-7911-4734
> >Currículo Lattes: http://lattes.cnpq.br/4264357546465157
> >Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
> >Rios de Ciência: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg

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