bwplot that give the user
control over the placement of the boxes. When used with a positioned
factor, the boxes are placed according to the position associated with
the factor.panel.bwplot.intermediate.hh(x, y, horizontal = TRUE,
transpose=!horizontal,
pch, col,
at=if (horizontal) levels(as.factor(y)) else levels(as.factor(x)), ## S-Plus only
...)panel.xyplot,
xyplot, interaction2wt,
position