[R] panel function SOLVED

[Martin Henry H. Stevens]

Hi Bernard,
Your solution was exactly right. I could have sworn I tried also  
panel.abline(a=mean(y,na.rm=TRUE), b=0) and, although it works now, I  
must have done something wrong such that it did not work.
THANK YOU
On Dec 20, 2005, at 2:18 PM, Berton Gunter wrote:

> You probably have missing values in your y data. Try:
> ...
> panel.abline(h=mean(y,na.rm=TRUE))
> ...
>
> -- Bert Gunter
> Genentech Non-Clinical Statistics
> South San Francisco, CA
>
> "The business of the statistician is to catalyze the scientific  
> learning
> process."  - George E. P. Box
>
>
>
>> -----Original Message-----
>> From: r-help-bounces at stat.math.ethz.ch
>> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Martin
>> Henry H. Stevens
>> Sent: Tuesday, December 20, 2005 10:30 AM
>> To: r-help at stat.math.ethz.ch
>> Subject: [R] panel function
>>
>> 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=function(x,y,...){
>> 	panel.xyplot(x,y)
>> 	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,
>> Hank
>>
>> 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
>> http://www.cas.muohio.edu/~stevenmh/
>> http://www.muohio.edu/ecology/
>> http://www.muohio.edu/botany/
>> "E Pluribus Unum"
>>
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>

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
http://www.cas.muohio.edu/~stevenmh/
http://www.muohio.edu/ecology/
http://www.muohio.edu/botany/
"E Pluribus Unum"