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Re: st: Stacked histogram - empty bins


From   Austin Nichols <austinnichols@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Stacked histogram - empty bins
Date   Fri, 29 Jul 2011 12:56:58 -0400

Nick--
IMHO, your simple example illustrates why -bihist- may be better when
the skyscrapers overlap considerably:

cap ssc inst bihist, replace
sysuse auto, clear
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) name(Manhattan)
bihist mpg, by(foreign) disc name(Underground)

On Fri, Jul 29, 2011 at 12:26 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> 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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