Try sample() which will allow you to randomly select 10 ID's from your
ID variable, which you can then plot.
Andrew Miles
On Dec 16, 2010, at 10:49 AM, Rasanga Ruwanthi wrote:
Hi
I am using following code to produce a xyplot for some longitudinal
data. There are 2 panels. It produced all longitudinal trajectories
with mean profile. But since the dataset it very large plot looks
very messy. I want to show, say 10 randomly selected individual
longitudinal trajectories together with mean profile for entire
dataset. Could any help me to alter the following code to do this?
or is there an alternative way?
Thanks in advance.
xyplot(Y~ time|status,groups=ID,data=heart,
type="l",lty=1, layout=c(2,1),main="",
panel = function (x, y, subscripts, groups, ...) {
panel.superpose (x, y, panel.groups =
"panel.xyplot",subscripts,groups, ...)
panel.loess (x, y, col = "Red", lwd = 2,span=0.75, ...)
})
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