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RE: st: RE: Graphing ploynomial relationships after a regression


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Graphing ploynomial relationships after a regression
Date   Tue, 18 Oct 2005 18:08:01 +0200

True, though I find it easier to continue to use my approach when my model gets more complex.

n j cox wrote:

> Even with Maarten's example, things can be made
> simpler. Starting as before,
>
> sysuse auto, clear
> gen weight2 = weight^2
> reg price weight weight2
>
> if you
>
> predict quad
> twoway mspline quad weight || scatter price weight
>
> you get the data shown as well.
>
> Alternatively, if you install the -modeldiag- package
> from either SSC or the Stata website, then
>
> predict quad
> regplot
>
> will give you the same graph. This is because -regplot-
> defaults to a plot of the observed and predicted response
> against the first predictor named.
>
> Maarten Buis
>
> sysuse auto, clear
> gen weight2 = weight^2
> reg price weight weight2
> sum weight
> twoway function y = _b[_cons]+_b[weight]*x+_b[weight2]*x^2, range(1760
> 4840)
>
>
> Tinna
>
> I am using an independent variable in its regular and squared forms in
> an OLS and 2SLS regressions.  Can I graph this polynomial relationship
> as indicated by the regression in an easy way?
>
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