Re: st: plotting a polynomial graph in STATA

[Kirimi Sindi <sindijul@msu.edu>]

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
> --------------------------
>
>
>       
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
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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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