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


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
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 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Nick Cox
> Sent: 24 February 2004 11:54
> To: statalist@hsphsun2.harvard.edu
> 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 
> n.j.cox@durham.ac.uk 
> 
> 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.

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