Monday, March 13, 2006

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

> -----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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