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Re: st: plotting a polynomial graph in STATA


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: plotting a polynomial graph in STATA
Date   Wed, 2 Dec 2009 20:39:34 +0000 (GMT)

--- On Wed, 2/12/09, Kirimi Sindi wrote:
> How do I plot a graph polynomial to show there is or no
> local inflection point?
> 
> I am running:
> 
> regress y  x  xsquared  xcubic
> 
> Is there a command after the regression to get STATA plot a
> graph?

Just for fun I also added a 95% confidence interval (lb/ub):

*--------------- begin example ----------------------
sysuse nlsw88, clear
gen ttl_exp2 = ttl_exp^2
gen ttl_exp3 = ttl_exp^3
reg wage ttl_exp*

predict yhat, xb
predict se, stdp
gen lb = yhat - invttail(e(df_r),0.025)*se
gen ub = yhat + invttail(e(df_r),0.025)*se
twoway rarea lb ub ttl_exp, sort astyle(ci) || ///
       line yhat ttl_exp, sort              
*--------------- end example ------------------------
( For more on how to use examples I sent to statalist see:
 http://www.maartenbuis.nl/stata/exampleFAQ.html )

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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