Hi all, 
  I am trying to test the significance of the random effect in the following model but I didn't find the way to do that.
I think that I can do it with LRT, removing the random effect and comparing both models, but an error appears...
  Can anybody help me with that?
   
  mod<-lmer(Riqsp~Distpza+logtam+logaisl+Densmin+(1|Sitio),sil,family=poisson,method="ML")

  Thanks,
  Silvina Fenoglio


Biol. María Silvina Fenoglio
Centro de Investigaciones Entomológicas
de Córdoba
Edificio de Investigaciones Biológicas y Tecnológicas
Fac. de Cs. Exactas, Fís. y Naturales- 
Universidad Nacional De Córdoba
Av. Vélez Sarsfield 1611-(X5016GCA)
Córdoba-ARGENTINA
TEL:00-54-351-4334141/4334152 int.418
       
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