Here is how I tried to do a simple side-by-side boxplot:
# Create new dataframe (cultivar, values, idx)
# cbind goes by column so the cn column is repeated for us
cultivars <- cbind(cultivar=wheat$cn, stack(wheat[2:15]))
boxplot(values ~ cultivar, data=cultivars,
main="Kernel distribution", xlab="Cultivar", ylab="Count")
abline("v"=1.5:5.5)
This approach generated different boxplots than what I saw I with Jim's,
but I could be doing something incorrectly.
--jason
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