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The examples here are created using R 2.6.2 for Windows XP. It uses the standard graphics package that R loads automatically when it starts.
The examples use hsb2 data set that can be downloaded as follows.
hsb2 <- read.table('http://www.ats.ucla.edu/stat/r/modules/hsb2.csv', header=T, sep=",")
attach(hsb2)
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boxplot(write)
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boxplot(write, xlab="write", boxwex=.4,
col="darkblue")
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boxplot(write ~ ses)
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seslab<-as.vector(c("low","medium", "high"))
sesf<-factor(ses, label=seslab)
boxplot(write ~ sesf, xlab="write by ses")
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boxplot(write ~ sesf, xlab="write by ses",
boxwex=.2, notch = TRUE,
col = "darkblue")
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# by two factors
boxplot(write ~ female + ses,
xlab="write by female and ses",
boxwex=.2)
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