[R-sig-ME] lme4 package

Ben Bolker bbo|ker @end|ng |rom gm@||@com
Sun Jul 3 00:14:41 CEST 2022

   There are lots of answers about this on the web:


or to search just the R mailing lists:


  Some set of your predictors is multicollinear (i.e., one predictor is 
an exact linear combination of some other set of predictors).  This is 
not necessarily a problem.  The most common cause is including a set of 
dummy variables that describe a complete set of possibilities (e.g. if 
you have habitat types A, B, and C, then including a dummy (0/1) 
variable for whether an observation comes from each habitat type will be 

On 7/1/22 3:56 PM, mina jahan wrote:
>   Hi,
> I want to run a linear mixed-effects model on the simulated data using the
> lme4 package. But after running the R code, I see this error:
> *fixed effect model matrix is rank deficient so dropping 1
> column/coefficient *
> How can I deal with this error?
> I look forward to receiving your reply. Thanks a lot in advance for your
> response.
> Best regards,
> Mina Jahangiri
> Ph.D. student of Biostatistics
> 	[[alternative HTML version deleted]]

Dr. Benjamin Bolker
Professor, Mathematics & Statistics and Biology, McMaster University
Director, School of Computational Science and Engineering
Graduate chair, Mathematics & Statistics

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