I think a better approach would be
twoway (kdensity weight if foreign==1) (kdensity weight if foreign==0)
or
twoway kdensity weight if foreign==1 || kdensity weight if foreign==0
because this allows you to display the curves for more than two groups, e.g.
twoway kdensity weight if rep==3 || kdensity weight if rep==4 ||
kdensity weight if rep==5
ben
On Thu, Sep 18, 2008 at 9:03 AM, Svend Juul <[email protected]> wrote:
>
> Nigussie wrote:
>
> I am PhD student and request your assistance on this issues. Suppose I
> have two columns variable "lnexp" and "region" where lnexp is log of
> expenditure (continuous) and region is a categorivsl variable; 1=Eastern
> region, 2=Southern region and 3= Northern region. If I want to draw
> kernel graphs of "lnexp" for these regions on one chart, what should I
> do on Stata 10? I need a command.
>
> ===============================================================
>
> You can use the addplot() option, like this:
>
> sysuse auto.dta , clear
> kdensity weight if foreign==1 , addplot(kdensity weight if
> foreign==0)
>
> 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: +45 8942 6090
> Home: +45 8693 7796
> Email: [email protected]
> __________________________________________
>
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