st: multiple histograms combined into one?

[Justin Gengler <jgengler@umich.edu>]

Thanks in advance for the suggestions:

I would like to produce a SINGLE histogram (unlike the two 
split-screen histograms produced using the 'by(...)' argument) that 
combines two histograms of some variable 'x' (i.e., x given some 
value of some other variable 'z') -- for example, a single histogram 
combining two individual histograms for some variable when sex == 0 
and when sex == 1.  Thus what I am looking for is akin to a bar plot 
with the over(...) argument specified, but of course with the output 
being a histogram rather than a bar plot.

For an illustration of what I am looking for, see this graph: 
http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=82.

Thanks again,

Justin Gengler

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