Let's say I have data in the following schema that describes the number of
purchases a company has received from each County in the US:

State | County | Purchases
---------------------------------------
NJ | Mercer | 550
CA | Orange | 23
....

I would like to visualize what states contribute the most to the overall
total, and furthermore within those states, what Counties contribute the
most. What are some recommended R visualizations for this type of data? I
created a treemap using map.market from the portfolio library, like the
following:

http://zoonek2.free.fr/UNIX/48_R/g126.png

Although this is an attractive visual, I want something that makes it easier
to compare the relative sizes of components at a glance (hard with a treemap
because rectangles have different aspect ratios). Does anyone have a
recommended alternate visualization?

Thanks!

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