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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.
set.seed(121343) u <- rnorm(100)
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#default histogram hist(u) |
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#with shading hist(u, density=20)
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#with specific number of bins hist(u, density=20, nclass=20)
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# proportion, instead of frequency
# also specifying y-axis
hist(u, density=20, breaks=-3:3,
ylim=c(0,.5), prob=TRUE)
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# overlay normal curve with x-lab and ylim
# colored normal curve
m<-mean(u)
std<-sqrt(var(u))
hist(u, density=20, nclass=15, prob=TRUE,
xlab="x-variable", ylim=c(0, 0.7),
main="normal curve over histogram")
curve(dnorm(x, mean=m, sd=std),
col="darkblue", lwd=2, add=TRUE)
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hist(u, density=20, nclass=15, prob=TRUE, xlab="x-variable", ylim=c(0, 0.8), main="normal curve over histogram") lines(density(u), col = "blue")
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# hist(u) is an object # names(uh) will show all of its components uh<-hist(u)
plot(uh, ylim=c(0, 40), col="lightgray",
xlab="", main="Histogram of u")
text(uh$mids, uh$counts+2, label=c(uh$counts))
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