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st: RE: help needed for fixed effects Negative Binominal regression model


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: help needed for fixed effects Negative Binominal regression model
Date   Mon, 13 Mar 2006 11:12:10 -0600

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of Xiaojin Chen
> Sent: Tuesday, March 07, 2006 12:55 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: help needed for fixed effects Negative Binominal regression
> model
> 
> Hello everyone:
> 
> I was just added to this list today and would like get some help about
> fixed
> effects negative binominal regression model.
> 
> I will be using a longitudinal data such as Adolescent Health. If I want
> to run
> a fixed effects negative binominal regression model, how should the data
> be
> structured? Add Health used the wide format, with each individual having
> one
> line and three variables measuring the same concept at three time points
> (Add
> Health has three waves so far).  I guess I should change it to the long
> format,
> that is, each time point should have one line and each individual should
> have
> three lines. Can I re-structure the data in Stata?
> 

Yes.  See [D] -reshape-  Also, the FAQ by Nick Cox "I am having problems
with the reshape command. Can you give further guidance?" located at

http://www.stata.com/support/faqs/data/reshape3.html

might be helpful.

> Second, I have no experience in STATA. If anyone has experience using
> fixed
> effects Poisson or negative binominal model, can you share some of the
> syntax
> with me? I checked the manual and it looks it's not too hard, but any help
> will
> be appreciated.

The basic syntax is:

-xtpoisson y x, i(id) fe-

-xtnbreg y x, i(id) fe-

You might also try the dialog boxes.

Scott



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