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st: RE: -twoway kernreg- ?

From   "Nick Cox" <>
To   <>
Subject   st: RE: -twoway kernreg- ?
Date   Thu, 20 May 2004 13:07:30 +0100

-kernreg- is a user-written command published 
in 1996. Thus it could not have been written 
to be compatible with the new graphics of 
Stata 8 released in 2003. The same 
applies to later versions by other authors with 
fewer bugs. (A corrected version of -kernreg- was never
released by its original authors.) 

However, all that is now historical detail, 
and other versions of -kernreg- would leave
you with the same graphics problem. 

I guess that you would be much better off 
using -locpoly-. 

. search locpoly 

will identify the source, and something like 

. locpoly mpg weight , <options> 
	plot(lfit mpg weight, <options>) 

should do what you want. 

> I wish to graph of a non-parametric plot of two variables 
> over a regression plot
> using the -twoway- command, and compare the linearity imposed 
> by a parametric
> -reg- fitting with a nonparametric smoothing.
> How is it possible to do that? 
> The warning I get is that "kernreg is not a twoway plot type"

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