Re: st: RE: Combining histograms

[Michael Hecker <Hecker.Michael@gmx.de>]

Deal Nick,
thank you very much. This looks like a very good starting point.

Thanks,
Michael

Am 20.05.2011 20:50, schrieb Nick Cox:
> "combine", "merge" both admit of different interpretations.
>
> You can use -graph combine-. You don't say what you typed or in what sense you "didn't manage to get the result".
>
> Otherwise I'll guess that you want to superimpose histograms.
>
> You can do that in various ways. Often it's hard work to stop bars of one variable occluding bars of the other variable.
>
> sysuse auto, clear
>
> twoway histogram trunk, width(2) start(0) bfcolor(none) blcolor(blue) freq
> || histogram mpg, width(2) start(0) bfcolor(none) blcolor(red) barw(1.7) freq legend(order(1 "`: var label trunk'" 2 "`: var label mpg'"))
>
> This is a 19th century way of comparing distributions. -qqplot- gives you a 20th century method with no binning choices or artefacts.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Michael Hecker
>
> I create two histograms using:
>
> hist X, saving(normal, replace)
> hist Y, saving(changed, replace)
>
> Is it possible two merge both gph-files into a single graph?
> I didn't manage to get the result with "graph combine".
> I want to have both histograms in a single chart to compare the
> distributions.
>
>
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