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st: no convergence

From   [email protected]
To   [email protected]
Subject   st: no convergence
Date   Thu, 17 Jan 2008 13:25:58 +0100

Dear Alls,

I have a big database in which the number of rows is equal to 2188934 and the number of column is approximate to 190 (including fixed effects), and I have 4 years.

I have estimated my model using both pooled and cross-section data by a Poisson.

While the pooled estimation converges, I have a problem when I run the cross-section data: The poisson is not concave. I did several proofs using different maximize options but the results do not change. what can I do?



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