rp.boxplot(ius2008$age)
rp.boxplot(ius2008$age, ius2008$gender)
rp.boxplot(ius2008$age, ius2008$dwell, facet = ius2008$gender)
with(ius2008, rp.scatterplot(age, dwell, facet = gender))
rp.boxplot(age, dwell, data = ius2008)
rp.boxplot(age, dwell, gender, ius2008)
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