Adding barplot to effect plots

This layer adds a barplot to an effect plots. Mainly useful for factor or binary effect plots.

l_fitBar(a.aes = list(), ...)

Arguments

a.aes	list of aesthetic mapping arguments that will be passed to `ggplot2::geom_bar`. For instance we could set `a.aes=list("fill"="red")` to change the colour of the barplot.
...	graphical arguments to be passed to ggplot2::geom_bar.

an object of class gamLayer.