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Re: st: Graphics: yline in foreground


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Graphics: yline in foreground
Date   Thu, 1 Nov 2007 16:54:34 +0000 (GMT)

--- "Sauermann J (ROA)" <J.Sauermann@ROA.unimaas.nl> wrote:
> When I want to add a line (e.g. yline(0) for indicating the 0-value
> in a residual plot) to a scatter plot, I use the following syntax:
> 
> 	scatter residuals xvar, yline(0)
> 
> where I have the residuals from a regression on the y-axis and any
> variable xvar on the x-axis. However, the added line "yline" is shown
> in the background (behind the "scatter") only and not in the
> foreground. Is there a way to bring this yline to the front? I think,
> there should be some option for that. 

I agree that there should be an option for that, but I haven't found it
either. A way around it is to create a second graph on top the first
graph containing the horizontal line. See the silly example below:

*------------------ begin example -----------------
sysuse auto, clear
twoway scatter mpg length, /*
*/ yline(18) msymbol(O)    /*
*/ msize(huge) mcolor(red)

twoway scatter mpg length,    /*
*/ msymbol(O)                 /*
*/ msize(huge) mcolor(red) || /*
*/ function y = 18,           /* <-- the second graph
*/range(140 240) clstyle(solid)    
*------------------- end example ------------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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