[R] plotting groupedData object

[Deepayan Sarkar]

On 5/1/06, Osman Al-Radi <osman.al.radi at gmail.com> wrote:
> Dear R-Help,
>
> I am using R2.3.0, nlme library on Windows XP.
>
> I created a grouped data object with y, subject, group and time variables.
>
> I can plot the data using
>
> plot.nfnGroupedData(form=y~time|subject,outer=~group)
>
> This gives me individual curves (connected points) for each subject in
> separate panels for each group.
>
> I would also like to add to the plot a curve with the mean y at each time
> point for each group. how can I do that?

Reproducible example please.

Deepayan