st: mosaic plot with an intensity dimension

["Dimitriy V. Masterov" <dvmaster@gmail.com>]

I would am trying to create the graph of customer data where y is
categorical customer type (4 integer values), x is binary new customer
variable, and z is a binary purchased or not variable. I would like to
create a mosaic plot of y and x to show the sizes of the groups, but
somehow express the percentage of customers who purchase the product
for each group using color intensity. I want to show that some group
has a really high purchase rate, but they are a small fraction of the
customers. Right now I do this with user-written spineplot using the
text option:

bys type new_cust: egen mean=mean(reorder_90)
replace mean=mean*100
gen mean2=string(mean, "%4.0f")
spineplot type new_cust, text(mean2) percent

This uses numbers rather than color intensity, and is harder to read
or to see patterns, at least for my brain. A rough example of what I
want to see is http://newsmap.jp, where the color intensity indicates
the number of related articles.

Is there a way of expressing the mean with color intensity? Is there a
better way of visualizing this data?

DVM
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