# RE: st: RE: Problems with graphing in Stata 8

 From "Nick Cox" <[email protected]> To <[email protected]> Subject RE: st: RE: Problems with graphing in Stata 8 Date Tue, 24 Feb 2004 12:28:41 -0000

```Uli Kohler points out privately that the last
example should be

line density? myresponse

Also, he suggests that the -kdensity- calls
would typically include a call to -at()-.
That's arguable either way.

Thanks to him for the correction and the
suggestion.

Nick
[email protected]

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Nick Cox
> Sent: 24 February 2004 11:54
> To: [email protected]
> Subject: RE: st: RE: Problems with graphing in Stata 8
>
>
> As Don implies, Branko's problem is
> essentially the same.
>
> Let's backtrack one step and look at the general
> choice here. The graph overlay
> facility is wonderful, but not always the
> only solution, or even the best. There's
> often a choice between fixing things upstream
> (generating separate variables ahead of the graph)
> and fixing things on the fly.
>
> If I had say five density estimates to superimpose,
> I would be tempted to do something like this
>
> forval i = 1/5 {
> 	qui kdensity myresponse if mygroup == `i', gen(density`i')
> }
>
> line density? , clp(dash dot solid dash_dot "_#-#")
> 	legend(label(1 "group 1") label(2 "2") label(3 "3") label(4 "4")
>
> 	label(5 "5"))
>
> The example shows how -label()- is an alternative to -order()-
> (and incidentally why you might prefer -order()-).
>
> Of course, there is some inelegance in generating the
> variables explicitly. The resulting graph command, however,
> tends to be easier to write, to debug and to understand
> afterwards.
>
> Do whatever seems more straightforward.
>
> Nick
> [email protected]
>
> Donald Spady to Branko Milanovic
>
> > Try this
> > twoway (kdensity HbH if sex==1) (kdensity HbH if sex==2,
> > legend(order(1
> > "male" 2 "female")))
> > I am unsure just how the 'order' part works, but it is necessary.
>
> > >What would be the way to do exactly the same thing as asked
> > by Donald but
> > >using kdensity instead of scatter. That is, I need to have
> > (say) kdensity
> > >fct for sex=1 and then for sex=2 and I want the two to be
> > overlaid. The
> > >commands that I used in Stata 7 do not work in Stata 8.

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```