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DATA MINING
Desktop Survival Guide by Graham Williams |
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Multiple Dot Plots |
# Suggested by Michael Friendly
pdf("graphics/rplot-trellis.pdf")
library(lattice)
data(barley)
n <- length(levels(barley$year))
trellis.device(new = FALSE, theme = col.whitebg())
dotplot(variety ~ yield | site,
data = barley, groups = year,
layout = c(2, 3), aspect = .5,
xlab = "Barley Yield (bushels/acre)",
key = list(points = Rows(trellis.par.get("superpose.symbol"),1:n),
text = list(levels(barley$year)), columns = n))
dev.off()
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