Dear colleagues,
I am trying to perform GLM ..but I got some objects masked: and an error message below a <- read.table(file.choose(), h<-T) > head(a) time treatment transinduc 1 1 CHA0+Db 1,0768 2 1 CHA0+Db 1,0706 3 1 CHA0+Db 1,0752 4 1 CHA0+Db 1,0689 5 1 CHA0+Db 1,1829 6 1 PCL+Db 1,1423 > attach(a) The following objects are masked from a (pos = 12): time, transinduc, treatment The following objects are masked from a (pos = 13): time, treatment The following objects are masked from a (pos = 14): time, treatment > summary(a) time treatment transinduc Min. :1.000 CHA0 :10 1,0488 : 6 1st Qu.:1.000 CHA0+Db: 9 1,0724 : 4 Median :1.000 Db : 9 1,0752 : 3 Mean :1.433 HEALTHY:15 1,0954 : 3 3rd Qu.:2.000 PCL :10 1,0001 : 2 Max. :2.000 PCL+Db :14 1,0005 : 2 (Other):47 m1<-glm(transinduc~time*treatment,data=a,family="poisson") Error in if (any(y < 0)) stop("negative values not allowed for the 'Poisson' family") : valor ausente donde TRUE/FALSE es necesario Adem�s: Warning message: In Ops.factor(y, 0) : '<' not meaningful for factors I DO NOT HAVE NEGATIVE VALUES IN MY DATASET, Do you know what is going wrong? Thank you for you help, Xavier [[alternative HTML version deleted]]
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