Hi all,

I'm interested in doing a dot plot where *both* the size and color (more
specifically, shade of grey) change with the associated value.

I've found examples online for ggplot2 where you can scale the size of the
dot with a value:

http://had.co.nz/ggplot2/graphics/6a053f23cf5bdfe5155ab53d345a5e0b.png

Or scale the color with the value:

http://had.co.nz/ggplot2/graphics/b17bf93530ff6695afb366e65677c17f.png

both of which are from here:
http://had.co.nz/ggplot2/geom_point.html

but I've been playing around with ggplot2 and couldn't figure out how to do
both at the same time - ideally i want size to increase with a value, and
the shade of grey to get lighter with increasing value.


Any help's appreciated, thanks!

Brian

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