[R] panel function

Martin Henry H. Stevens hstevens at muohio.edu
Tue Dec 20 19:30:21 CET 2005

R v. 2.2.0 on Mac OS 10.4.3
lattice v. 0.12-11

I am trying to add a horizontal panel mean line to a series of panels  
in a trellis plot (i.e. a horizontal line at the mean of  y for each  
individual panel). I have tried innumerable ways to do this,  
including the code below, but if it works at all, it merely puts a  
horizontal line in the last panel.

xyplot(diss ~ Nut-7|Size, data=dathdiss, pch=1, jitter.data=TRUE,  
	panel.abline(a=mean(y),b=0) #This results in the correct line in the  
last panel, but no other lines at all.

Any and all thoughts are appreciated.
Thank you kindly,

Dr. Martin Henry H. Stevens, Assistant Professor
338 Pearson Hall
Botany Department
Miami University
Oxford, OH 45056

Office: (513) 529-4206
Lab: (513) 529-4262
FAX: (513) 529-4243
"E Pluribus Unum"

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