Well, the 'norm' option simply adds another -twoway- plot to the
kernel density; if you are using -twoway- anyway, you can call it
yourself:
twoway (function y = normden(x,mean,sd))
I reckon that allowing the 'norm' option in -twoway kdensity- would
clash with general -twoway- behaviour (options for legends,
xrange/yrange etc.).
Eva
2008/10/15 George Hoffman <[email protected]>:
> I'm trying to overlay two (or more) kdensity plots.
>
> kdensity accepts the 'norm' option
> twoway kdensity does not - see log below
>
> I thought twoway calls kdensity - but I must have a misunderstanding of
> stata 10 graphics....
>
> An explanation of principle would be most appreciated.
> Thank you,
> George Hoffman
>
>
>
> This my Stata 10 log:
>
> . two (kdensity rso2c if vmi85==0) (kdensity rso2c if vmi85==1)
>
> . two (kdensity rso2c if vmi85==0,norm) (kdensity rso2c if vmi85==1,norm)
> option norm not allowed
> r(198);
>
> . kdensity rso2c if vmi85==0,norm
>
> . two kdensity rso2c if vmi85==0,norm
> option norm not allowed
> r(198);
>
=
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