[R-meta] Testing multicollinearity between categorical predictors

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,

Rafael.
_______________________________________________________

*Prof. Dr. Rafael Rios Moura*

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

ORCID: http://orcid.org/0000-0002-7911-4734
Curr?culo Lattes: http://lattes.cnpq.br/4264357546465157
<http://orcid.org/0000-0002-7911-4734>
<http://lattes.cnpq.br/4264357546465157>
<http://lattes.cnpq.br/4264357546465157>Research Gate:
https://www.researchgate.net/profile/Rafael_Rios_Moura2
<http://orcid.org/0000-0002-7911-4734>
Rios de Ci?ncia: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg
<http://orcid.org/0000-0002-7911-4734>


Em sex., 19 de jun. de 2020 ?s 05:40, Viechtbauer, Wolfgang (SP) <
wolfgang.viechtbauer at 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 at gmail.com]
Sent: Wednesday, 17 June, 2020 2:28
To: Viechtbauer, Wolfgang (SP); r-sig-meta-analysis at 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
Laborat?rio de Ecologia e Zoologia (LEZ)
UEMG - Unidade Ituiutaba

ORCID: http://orcid.org/0000-0002-7911-4734
Curr?culo Lattes: http://lattes.cnpq.br/4264357546465157
Research Gate: https://www.researchgate.net/profile/Rafael_Rios_Moura2
Rios de Ci?ncia: https://www.youtube.com/channel/UCu2186wIJKji22ai8tvlUfg