st: differences between kdensity plots

[Richard Goldstein <richgold@ix.netcom.com>]

I have produced a graph with two kdensity plots on it (one for the age 
of each of two groups of people) -- I am now interested in producing 
some statistics about the difference(s) between these plots; I have 
never thought about this issue before and wonder if there are any 
"standard" or common differences that are used to describe (or even to 
test) the differences between the two plots.

Note that I assume I can use the undocumented twoway__kdensity_gen 
command to obtain the data underlying each plot. If anyone has used this 
and thinks I am wrong in my reading of the help file, please tell me.

Note also that there may well be numerous kinds of differences and I 
don't wish to eliminate any possibilities at this time.

Thanks,

Rich
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