> y<-cy<-c(15,16,17,0,20,50,0,11,60,12) > x<-c(1,6,3,11,13,20,12,14,15,3) > gamma<-glm(y~x,family=Gamma())Error in eval(expr, envir, enclos) : Non-positive values not allowed for the gamma family but if i change data of y is> y1<-c(15,16,17,12,20,50,51,11,60,12) ###### doesn't have zero then I can run.Gamma Distribution can run for y >= o ?? I would like to know, why? Thand and Best regards, Mathinee --------------------------------- [[alternative HTML version deleted]]