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Hi there, I have a rather large data set and perform the following cox model: test1 <- list(tstart,tstop,death1,chemo1,radio1,horm1) out1<-coxph( Surv(tstart,tstop, death1) ~ chemo1+chemo1:log(tstop+1)+horm1+horm1:log(tstop+1)+age1+grade1+grade1:log(tstop+1)+positive1+positive1:log(tstop+1)+size1+size1:log(tstop+1), test1) out1 Up to here everything works fine (with each covariate having a length of 289205) Now I want to see a specific profile of the above model so I ask for: x11() profilbig2=(survfit(out1,newdata=data.frame(chem...

I have a matrix with 3 years of data (2006, 2009, 2010). I am trying to split this matrix by year so that I have 3 separate matrices. My matrix looks like this:     Q16.1 Year Gender Grade1       3 2006      1     52       2 2006      0     53       3 2006      0     54       3 2006      0     55       3 2006      1     56       2 2006      0     57       3 2006      0     58       3 2006      1     59       3 2006      0     510      3 2006      0     511      3 2006      0     512  ...

...a specified point. Can this be done? Last, I'm not sure I want the abline to extend the entire region of the chart, but maybe say to the middle of the barplot. I would appreciate any thoughts on this. Any thoughts on code to improve the chart is also appreciated. Harold Windows XP ver 1.9 Grade1<-c(0,0,0,0) Grade2<-c(0,0,0,0) Grade3<-c(0,0,0,0) Grade4<-c(0,0,0,0) Grade5<-c(250,100,100,100) foobar<-cbind(Grade1,Grade2,Grade3,Grade4,Grade5) barplot(foobar,names=c("Grade 1", "Grade 2", "Grade 3", "Grade 4", "Grade 5"), col=c...