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st: RE: Dynamic panel model for count data?

From   "Millimet, Daniel" <>
To   "" <>
Subject   st: RE: Dynamic panel model for count data?
Date   Mon, 26 Nov 2012 22:40:21 +0000

Trivedi covers possible specifications here:

The Wooldridge approach on slide 61 can be implemented using a dynamic poisson RE model (xtpoisson) including a lagged dependent variable and a linear projection of the original unobserved effect on x-bar and the initial condition. The other approaches are implemented using GMM.

Daniel L. Millimet, Professor
Department of Economics
Box 0496
Dallas, TX 75275-0496
phone: 214.768.3269
fax: 214.768.1821

-----Original Message-----
From: [] On Behalf Of Robert Fornango
Sent: Monday, November 26, 2012 3:28 PM
To: Statalist
Subject: st: Dynamic panel model for count data?

Dear Stata users:
I would like to estimate a dynamic panel model, such as that performed by
-xtabond2- or -xtdpdsys-, with potentially endogenous regressors. However, my dependent variable is a non-negative count that exhibits over-dispersion.
My sample consists of approximately 75 units, observed over 8 time periods (after losing 2 time periods to lags).

I am wondering if anyone knows of a Stata routine to estimate such a model?

Any advice will be greatly appreciated.

Robert J Fornango, PhD
Chief Executive Officer
F1 Analytics LLC

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