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


From   Donald Spady <dspady@ualberta.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Problems with graphing in Stata 8
Date   Mon, 23 Feb 2004 11:59:52 -0700

Branko
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.
Don

At 11:45 AM 2/23/2004, you wrote:

Nick,

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.

Thanks.

Branko Milanovic

----- Original Message -----
From: "Nick Cox" <n.j.cox@durham.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, February 23, 2004 1:16 PM
Subject: RE: st: RE: Problems with graphing in Stata 8


> You don't have to do it this way. As said,
> you can approach it from the direction you
> started from. Something like
>
> twoway (scatter HbL HbH if sex==1, ms(Oh)) (scatter HbL HbH if
> sex==2, ms(D) legend(order(1 "male" 2 "female")))
>
> should work. The difference is between overlaying two
> graphs and drawing one. When it is more like a matter
> of overlaying five or six graphs, the issue takes
> on a different shape.
>
> By the way, what you're puzzled by is not a graphical
> issue. If you
>
> . list HbL HbH if sex == 1
>
> the condition "if sex == 1" is left on the command
> line and not echoed in the output in any direct way,
> although it does affect the results you get.
>
> Nick
> n.j.cox@durham.ac.uk
>
> Donald Spady
> >
> > It works.  Seems a rather roundabout way to do this, having
> > to create new
> > variables, but it works.
> > Many thanks
>
> > >Some recent threads have touched on this
> > >question.
> > >
> > > >From Stata's point of view both graphs are
> > >graphs of -HbL- versus -HbH-. -sex- is merely
> > >the criterion you used to select points and
> > >it doesn't feature in the graph. Why should
> > >it? Both -if- conditions are upstream filters
> > >determining what gets passed to the graph-drawing
> > >commands.
> > >
> > >What you did can be tweaked to get what you
> > >want, but for similar problems I favour this
> > >kind of approach (and indeed -separate- was
> > >written largely for this purpose):
> > >
> > >separate HbL, by(sex)
> > >scatter HbL? HbH , legend(order(1 "male" 2 "female"))
> > >
> > >Nick
> > >n.j.cox@durham.ac.uk
> > >
> > >Donald Spady
> > > >
> > > > when I plot twoway (scatter HbL HbH if sex==1) (scatter HbL HbH if
> > > > sex==2)  I expect to get an overlaid plot with corresponding
> > > > HbL & HbH
> > > > having one symbol if sex==1 and another symbol if sex == 2.  I get
> > > > different symbols, but in the legend box I get a blue diamond
> > > > signifying
> > > > HbL and a brown diamond signifying HbL.  That's right, both
> > > > signify HbL
> > > > and neither one signifies sex, which I expected.  What is
> > > > going on?  What
> > > > am I doing (or interpreting) wrong?
>
> *
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>

*
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Donald Spady

Department of Pediatrics
2C3.92 WMC, University of Alberta
Edmonton, Alberta, Canada
T6G 2R7

780-407-1244:O
780-407-7136:F

Nature has no reset button.

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