[R] multiple lowess line in one plot

[Gregory Snow]

Here is one approach using lattice (trellis) graphics:

tmp.state <- data.frame( Frost=state.x77[,'Frost'], 
	Murder=state.x77[,'Murder'], 
	Region=state.region)

library(lattice)
trellis.par.set(col.whitebg())
xyplot( Murder ~ Frost, groups=Region, data=tmp.state,
	panel.groups=function(...){panel.loess(...);panel.xyplot(...)}
,span=.8)


Just substitute in your variables and variable names.

Hope this helps,



-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Dean Sonneborn
> Sent: Wednesday, January 04, 2006 9:54 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] multiple lowess line in one plot
> 
> I'm using this code to plot a smoothed line.  These two 
> columns of data really represent 4 groups and I'd like to 
> plot a separate line for each group but have them all in the 
> same plot. The R-Docs for lowess do not seem to indicate some 
> type of "GROUPS=var_name" option. What would be the syntax for this?
> 
> plot(AWGT ~ lipid )
> lines(lowess(lipid , AWGT, f=.8))
> 
> 
> --
> Dean Sonneborn, MS
> Programmer Analyst
> Department of Public Health Sciences
> University of California, Davis
> (530) 754-9516
> 
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