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library(poliscidata)

# Collapsing numeric variables into roughly equal-sized groups (quantiles)
describe(world$pop_urban)
world$pop_urban.5cat = cut2(world$pop_urban, g=5)

# the next two lines not strictly necessary but should check our work
levels(world$pop_urban.5cat)
freq(world$pop_urban.5cat, plot=F)
Watch & Learn
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From Jacob Koehler (4:22).
 Working with pnorm, qnorm, and dnorm Functions
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From Roger Peng (9:47).
 The ggplot2 Plotting System, Part 2a
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