overlay of two sets of boxplots

-----Original Message-----
From: appel at neuro.mpg.de
Sent: Mon, 20 Feb 2012 10:27:11 +0000
To: r-help at r-project.org
Subject: [R] overlay of two sets of boxplots

Hello,
I am new to R and currently have the following problem:
I have successfully loaded my data in R which consists of two numeric
columns (LI_F and female) and one character column (Strain). So far I can
plot two different set of boxplots for each of the numeric columns
plotted by the groups of the character column and the commands look like
that:

boxplot(LI_F~Strain, ylab="LI_F", xlab="Strain", data=pain)
boxplot(female~Strain, ylab="female", xlab="Strain", data=pain)

How can I overlay the two set of boxplots (preferably in different
colors), so that I can compare them one by one, meaning two boxplots
corresponding to the same character in "Strain" are directly above each
other?
I have tried a lot of things and would greatly appreciate your help.

Best,
Mirjam

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