The cond.plot function provides simple conditional plots with
base graphics. All plot styles are conditional upon z. Up to
nine conditional plots are produced in a panel.
Plots include:
boxplot: y ~ x | z
densover: f(x | z)
hist: x | z
scatter: x, y | z
smoothscatter: x, y | z
The cond.plot function is not intended to try to compete with
some of the better graphics packages, but merely to provide simple
functionality.