Categorical Scatter (Violin Point) Plots
c(
    person(given="Erik", family="Clarke", role=c("aut", "cre"), email="erikclarke@gmail.com"),
    person(given="Scott", family="Sherrill-Mix", role=c("aut"), email="sherrillmix@gmail.com"))
Provides two methods of plotting categorical scatter plots such
    that the arrangement of points within a category reflects the density of
    data at that region, and avoids over-plotting.
Erik Clarke [aut, cre],
  Scott Sherrill-Mix [aut]