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...and trying to use lmer. That works, but I m not sure if my code is right, so I would just like to get an opinion from the experts. I have a Growthrate of plants (RGR Fixed Factors: Fertilizer, Status (alien or native plants) and their interaction Random Factors: Age is a covariable; than I have plantfamily and Species nested within Family. Now I want also to test for the interaction of Fertilizer with plantfamily and species. Did I do this the right way, and is the 0+ necessary? model<-lmer(RGR~Fertilizer+Status+Fertilizer:Status+(1|Age)+(1|Family/Species)+(0+Fertilizer|Family/Species),data=rg...