This is fairly simple using lattice graphics:
USJudgeRatings - USJudgeRatings[,1:4]
USJudgeRatings$group - factor(c(rep(1, 22), rep(0, 21)))
library(lattice)
splom( ~USJudgeRatings[,1:4], groups=group, data=USJudgeRatings,
type=c('p','smooth'))
The ggplot2 package probably makes this easy as well (but I am still learning
that).
If you really need to use the pairs function then you will need to create your
own panel function (which could call panel.smooth).
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] On Behalf Of Marie-Pierre Sylvestre
Sent: Wednesday, September 08, 2010 8:03 AM
To: r-help@r-project.org
Subject: [R] pairs and panel.smooth for two groups
Hi,
I have modified the USJudgeRatings data (available in R) to
illustrate my question.
# Use the first 4 variables of USJudgeRatings and add a group variable
with two levels
USJudgeRatings - USJudgeRatings[,1:4]
USJudgeRatings$group - factor(c(rep(1, 22), rep(0, 21)))
# I can draw a pairs graph where members of each group are drawn in
different colors:
pairs(USJudgeRatings[,1:4], col = c(2,3)[USJudgeRatings$group], pch =
c(21,3)[USJudgeRatings$group])
# I would also like to add a smooth line to each subplot like
pairs(USJudgeRatings[,1:4], panel=panel.smooth)
# but I want the smooth to be done for each of the group, i.e. I want
two smooths per subplot.
# this creates only one smooth
pairs(USJudgeRatings[,1:4], col = c(2,3)[USJudgeRatings$group], pch =
c(21,3)[USJudgeRatings$group], panel = panel.smooth)
# I understand that panel.smooth is a function that is called for each
subplot. I don't know how to tell it to do a smooth for each of my
group in each of the subplot.
Any help would be appreciated!
Best,
Marie-Pierre
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