[R-meta] Testing multicollinearity between categorical predictors

[Viechtbauer, Wolfgang (SP)]

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