Thanks:

Grant @grantmcdermott, the project looks really nice and useful, thanks!

Wishlist:

I just wanted to put on the wishlist that in addition to numeric x and y, it would be great if the factor-based plot() flavors were also supported in plot2(). Especially the plots where y is a factor are in my opinion underappreciated in base R. (It's not surprising that I would say that because I implemented these...)

Plots:

In plot(x, y, ...) and plot(y ~ x, ...) we have the following:

	`x` Numeric	Factor
`y` Numeric	Scatterplot	Parallel boxplots
Factor	Spinogram (Spineplot with histogram-style breaks in `x`)	Spineplot (Flavor of mosaic plot)

Examples:

data("SwissLabor", package = "AER")
plot(income ~ age, data = SwissLabor)            ## Numeric ~ Numeric
plot(income ~ foreign, data = SwissLabor)        ## Numeric ~ Factor
plot(participation ~ age, data = SwissLabor)     ## Factor ~ Numeric
plot(participation ~ foreign, data = SwissLabor) ## Factor ~ Factor

It would be great if the plots above would work with plot2() as well - and if the coloring and grouping etc. would also be supported.

GM edit: adding checklist to track

Numeric ~ Numeric
Numeric ~ Factor (Support type = "boxplot" #154)
Factor ~ Numeric
Factor ~ Factor