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st: Re: Quadratic regression


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Quadratic regression
Date   Tue, 17 Feb 2009 08:15:45 +0100

<>

Three responses advised you to create a new variable and then use -regress-. Note, though, that a better option would be to use -nl-

nl (y = {a} + {b1}*x + {b2}*x^2), variables(x)

as in http://www.stata-journal.com/article.html?article=st0141

which would allow Stata to know that x and x squared "move in tandem" and calculate the correct marginal effects...

HTH
Martin
_______________________
----- Original Message ----- From: "Shell makka" <shell.makka@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Tuesday, February 17, 2009 4:18 AM
Subject: st: Quadratic regression


Dear statalist


It would be greatly appreciated if you can answer my question.
I would like to fit a quadratic regression Model (Y=a+bX+cX^2) on my
data and do predictions , would you please let me know what will be
the code for that in stata?


Many thanks,
Shell
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