-kdensity- is another option.
. twoway (kdensity weight if foreign==1) (kdensity weight if
foreign==0), legend(lab(1 "Foreign") lab(2 "Domestic"))
Friedrich
--- Svend Juul <[email protected]> wrote:
> Ali wrote:
> I need to see the effect of a binary exposure variable on the
> distribution of
> birthweight. I expect that there is a shift in the ditribution and
> want to show
> this shift by producing a histogram which shows the distribution of
> exposed and
> unexposed seperately but on the same plot. Is there a code that can
> do this in
> Stata?
>
> ----------------------------------------------------------
> To be precise: I think you ask for two PLOTS (histograms) on the
> same GRAPH,
> i.e. in the same coordinate system. Let's use the auto dataset,
> although it
> is about carweights, not babyweights.
>
> Friedrichs suggestion:
>
> sysuse auto , clear
> histogram weight , by(foreign)
>
> I don't think that is what you wanted, but we may come closer by
> putting the
> two graphs in one column:
>
> histogram weight , by(foreign , col(1))
>
> I would improve it, (1) by removing a rather useless note, (2) by
> controlling
> the bins, and (3) by displaying frequency rather than density:
>
> histogram weight , frequency start(1500) width(500) by(foreign ,
> col(1) note(""))
>
> If you really want the two groups within the same coordinate
> system, I don't
> see how -histogram- can do it, but we can make -graph bar- do this:
>
> egen weightgr = cut(weight) , at(1500(500)5000)
> generate x=1
> graph bar (sum) x , over(foreign) over(weightgr) asyvars
>
> I don't think it is better than the histogram solution. But there
> is another
> good solution with -dotplot- (it is described in the [R] manual):
>
> dotplot weight , over(foreign) center
>
> Hope this helps
> Svend
>
> ________________________________________________________
>
> Svend Juul
> Institut for Folkesundhed, Afdeling for Epidemiologi
> (Institute of Public Health, Department of Epidemiology)
> Vennelyst Boulevard 6
> DK-8000 Aarhus C, Denmark
> Phone, work: +45 8942 6090
> Phone, home: +45 8693 7796
> Fax: +45 8613 1580
> E-mail: [email protected]
> _________________________________________________________
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