Dear AnjaM
There may be better ways of dealing with this, but the following works:
densityplot(~gcsescore | factor(score), groups=gender, data=Chem97,
auto.key=TRUE, plot.points=FALSE, ref=TRUE,
panel=function(x,...){
panel.densityplot(x,...)
median.values <- tapply(Chem97$gcsescore, Chem97$gender, median)
panel.abline(v=median.values, col=c("blue","red"))
panel.grid(v=2)}
)
Regards,
José Iparraguirre
Chief Economist
Age UK
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of AnjaM
Sent: 20 November 2012 14:13
To: r-help@r-project.org
Subject: [R] lattice density plot: add vertical lines at groupwise medians for
all panels
Suppose you have the following code:
########## Start code##########
data(Chem97, package="mlmRev")
densityplot(~gcsescore | factor(score), groups=gender, data=Chem97,
auto.key=TRUE, plot.points=FALSE, ref=TRUE,
panel=function(x,...){
panel.densityplot(x,...)
median.values <- median(x)
panel.abline(v=median.values)}
)
########## End code##########
For some reason I don't understand, this adds only the median for one group
(in this case for gender == M) into each panel. How do I calculate and add
the medians for both groups in the right group colour?
This is what I tried:
########## Start code##########
densityplot(~gcsescore | factor(score), groups=gender, data=Chem97,
auto.key=TRUE, plot.points=FALSE, ref=TRUE,
panel=function(x,..., groups){
panel.densityplot(x,..., groups)
median.values <- tapply(x, groups, median)
panel.abline(v=median.values)}
)
########## End code##########
However, this gives an error. What's going wrong and how can I solve this
problem?
--
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