Re: [R] xyplot

From: Deepayan Sarkar <>
Date: Thu 05 Oct 2006 - 21:11:03 GMT

On 10/5/06, Osman Al-Radi <> wrote:
> Hi,
> for the data below:
> time<-c(rep(1:10,5))
> y<-time+rnorm(50,5,2)
> subject<-c(rep('a',10),rep('b',10),rep('c',10),rep('d',10),rep('e',10))
> group<-c(rep('A',30),rep('B',20))
> df<-data.frame(subject,group,time,y)
> I'd like to produce a plot with a single pannel with two loess curves one
> for each group. the code below does that but on two different pannels, I'd
> like to have both curves on the same pannel with different colors.
> xyplot(y~time|group, groups=subject,
> panel=function(...){
> panel.loess(...)
> }
> ,data=df)

Well, the "fix" for your code is

xyplot(y ~ time | group, data = df, groups = subject,

       panel = panel.superpose,
       panel.groups = function(...) panel.loess(...)


Which, incidentally is effectively equivalent to

xyplot(y ~ time | group, data = df, groups = subject, type = "smooth")

However, this is not what you describe as your goal. If you want a single smooth for each group combining all subjects within that group, use something like

xyplot(y ~ time, data = df, groups = group. ...

The panel part does not change.

-Deepayan mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Fri Oct 06 07:49:43 2006

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