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?

Thanks

--
Osman O. Al-Radi, MD, MSc, FRCSC
Fellow, Cardiovascular Surgery
The Hospital for Sick Children
University of Toronto, Canada

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