[R] question on xyplot

[Zhongming Yang]

Dear All:
 
In the attached file, I have 3 group patients, and there are 5 in each group (the groups are decided by the prefix of the idno). I want draw a repeat measurement comparison figure. My goal is to list 5 patients from same group on one  horizontal line. But xyplot sounds pick them randomly (or I was confused?). Could you please help me modify the following code to accomplish this?
 
Thanks
 
Zhongming Yang
 

library(nlme)
library(lattice)
md <- read.table('../data/sample.txt', header=T)
md <- groupedData(md ~ month | idno, data=md)
trellis.device(theme=col.whitebg())
xyplot(md ~ month | idno, data=md, main="title", 
   xlab="x", ylab="y", layout=c(5, 3),
   panel=function(x, y){
   panel.xyplot(x, y)
   panel.lmline(x, y, lty=2)
        }
   )
 




		
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