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Re: st: plotting a polynomial graph in STATA


From   Kirimi Sindi <sindijul@msu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: plotting a polynomial graph in STATA
Date   Wed, 02 Dec 2009 16:02:33 -0500

Maarten,

Thank you very much, your suggestions works very well.

Kirimi

Maarten buis wrote:
--- 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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--
*******************************
Imagination is more important than knowledge. For while knowledge defines all we currently know and understand, imagination points to all we might yet discover and create.
*******************************

Kirimi Sindi
PhD Candidate
Department of Agricultural,
Food, and Resource Economics
Room 20 Cook Hall
Michigan State University
East Lansing,  MI  48824
Telephone: +1-517-353-5320
Cell : +1-517-505-9629	
Fax: +1-517-432-1800

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