Downtown or Manhattan skyline plots are a few lines to get going:
. twoway__histogram_gen mpg if foreign, gen(f_foreign f_mpg) start(10) width(2)
. twoway__histogram_gen mpg if !foreign, gen(f_domestic g_mpg) start(10) width(2)
. line f_foreign f_mpg, c(J) || line f_domestic g_mpg, c(J)
-- but the result needs more work to be made presentable and I dislike them with a passion, so sorry, no .ado from me.
Nick
n.j.cox@durham.ac.uk
David Radwin
This topic of comparing distributions using multiple histograms has
appeared before, usually in the form of showing overlapping histograms.
See, e.g., http://www.stata.com/statalist/archive/2008-09/msg01336.html ,
http://www.stata.com/statalist/archive/2003-05/msg00653.html, or a couple
of examples on http://www.survey-design.com.au/Stata%20Graphs.html . There
are also numerous cautions against using histograms at all and ideas (like
Nick Cox's earlier suggestions) for alternative graph types.
I have occasionally wished for a "line histogram" that would just show a
line for the top and sides of each histogram without the other lines
defining each bar, similar in appearance to Stata's -kdensity- but with
right angles only (approximately like -kdensity- with the option
-kernel(rectangular)-). If I were a better programmer, I would write such
a program myself.
In the meantime, one more suggestion (but not quite what you want) is
Austin Nichols's -bihist- or -byhist-, both available from SSC.
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