st: aweights for overall data when analyzing subsets of data

[Laura Grant <contributary@gmail.com>]

I am scatter-plotting data for two subsets where I also care about a
third dimension, such a population. I want to represent population
using relative sizing of the symbols, by -aweight-

However, running

twoway (scatter y x [w= population] if  use<50, msymbol(Oh)) (scatter
y x [w= population] if  use>=50, msymbol(Oh) )

produces two subsets of the data in the same graph, but it splits up
the weighting calculation so that the two sets' symbol sizes are NOT
comparable. I would like to have the weights be over the entire data
set. How? I think I should be able to -gen- the aweights as a variable
then maybe tell Stata these are iweights?

Thanks, Laura
--
http://www2.bren.ucsb.edu/~lgrant/
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