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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 below 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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a<-table(ses) barplot(a)
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seslab<-as.vector(c("low","medium", "high"))
fses<-factor(ses, label=seslab)
sesstat<-table(fses)
barplot(sesstat, xlab="ses")
# alternatively a<-table(ses)
seslab<-as.vector(c("low","medium", "high"))
barplot(a, names.arg=seslab, xlab="ses")
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seslab<-as.vector(c("low","medium", "high"))
fses<-factor(ses, label=seslab)
sesstat<-table(fses)
barplot(sesstat, space=2, xlab="ses")
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# change the width and spacing
# xlim is required for width=
# to take effect
barplot(sesstat, xlim=c(0,5), space=1.5,
width=.5, xlab="ses")
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b<-table(ses, female) barplot(b)
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b<-table(ses, female)
barplot(b, beside=T, xlab="cell count
by ses and female")
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