Dear All,

I am trying to run glmer models to test the effect of noncrop % and management effect on P/A data with 27000 records. I used the following code:

glmer100<-glmer(Present~Management+NonCrop100+(1|Plot.No), 
          family=binomial, data=Presence)

and it works fine, but when I tried to add the species name as follows:

glmer100<-glmer(Present~Management+NonCrop100+Short.Name+(1|Plot.No), 
          family=binomial, data=Presence)

It gave me the following warning:

Warning in rankMatrix(X) :
  rankMatrix(<large sparse Matrix>, method = 'tolNorm2') coerces to dense matrix.
  Probably should rather use  method = 'qrLINPACK' !?
Can any one help me,

Thanks,
Hamada Elsayed Ali
PhD Candidate in Biogeographical Modelling,
University of Bayreuth
Universitaetsstr. 30
95440 Bayreuth, Germany
Email: hamada.ali@uni-bayreuth.de
 		 	   		  
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