TITLE(interactionplot @@ Interaction Plot)
USAGE(
interactionplot(data, rowfactor, columnfactor,
	use.mean=true, data.order=true)
)
ARGUMENTS(
ARG(data @@ a  vector containing the data.)
ARG(rowfactor @@ a vector containing the levels of the row factor.)
ARG(columnfactor @@ a vector containing the levels of the column factor.)
ARG(use.mean @@ if LANG(true), the mean is used, otherwise the median.)
ARG(data.order @@ if LANG(true), the factor levels are taken in the order
in which they first appear in the data, otherwise in alphabetical order.)
)
DESCRIPTION(
LANG(interactionplot) draws a plot of cell means (medians)
versus row factor levels separately for each level of the column factor.
)
