Hi:
Like this?
xyplot(y~day|sex, groups=trt, data=dat, type=c('p','g', 'a'))
The 'a' stands for average line, or 'connect the averages at different x
values'.
By using the groups = trt argument, you get one line per treatment group in
each panel.
A complete list of valid types is given on p. 75 of the Lattice book
(Sarkar, 2008).
Related types are:
'l' : join points by lines
'r': least squares line
'smooth': loess smooth
HTH,
Dennis
On Fri, Aug 20, 2010 at 3:07 PM, array chip <arrayprof...@yahoo.com> wrote:
> Hi, I am a beginner of xyplot() (or lattice package). On one hand, I
> immediately
> realized it's a very powerful utility. On the other hand, there are too
> many
> things for me to learn. Still haven't figure out a generalization of the
> syntax
> and usage under many different circumstances.
>
> Let me give an example dataset:
>
>
>
> xxx<-cbind(expand.grid(day=0:7,trt=c('A','B','C'),sex=c('M','F')),subject=rep(1:60,each=8))
>
> xxx<-xxx[sort.list(xxx$trt),]
> y<-c(rnorm(160,15),rnorm(160,10),rnorm(160,5))
>
> dat<-cbind(y=y,xxx)
>
> str(dat)
> 'data.frame': 480 obs. of 5 variables:
> $ y : num 13.4 15.3 14.4 16.2 15.1 ...
> $ day : int 0 1 2 3 4 5 6 7 0 1 ...
> $ trt : Factor w/ 3 levels "A","B","C": 1 1 1 1 1 1 1 1 1 1 ...
> $ sex : Factor w/ 2 levels "M","F": 1 1 1 1 1 1 1 1 2 2 ...
> $ subject: int 1 1 1 1 1 1 1 1 4 4 ...
>
> So this is a typical longitudinal dataset: each subject has measurements
> for 8
> days (0 to 7), there are 3 treatments (A, B and C), and sex factor (M and
> F). I
> would like to have 2 plots, one for each sex. Within each plot, I want to
> plot 3
> averaged lines (average of y for each day), one for each treatment group.
> How
> can I do this?
>
> I tried the following using panel.average(), but it seems that the groups
> information was not passed automatically to panel.average().
>
>
> xyplot(y~day|sex, groups=trt, data=dat, type=c('p','g'),
> panel=function(...)
> {panel.xyplot(...); panel.average(..., fun=function(x)
> mean(x,na.rm=T),horizontal=F,col=1:3)})
>
> Appreciate if anyone can help.
>
> John
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
