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