st: Stacked Histogram

[Marcello Pagano <pagano@hsph.harvard.edu>]

Dear Listers,

Has anyone got code for allowing a second, categorical variable into the 
histogram?  What I am thinking of is the freq variable is the primary 
variable going into the histogram, but there might be a second variable, 
age, say, categorised as `young' and `old'. Then think of each bar in 
the histogram displayed as a two colour bar, black and white, say, where 
the black part represents the proportion of that bar who are young, and 
the white represents the proportion of that bar who are old. A sort of 
stacked-bar-meet-histogram kind of plot.

Thanks,

m.p.
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