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st: no convergence after tsset


From   "Laura Seelkopf" <Laura-Seelkopf@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: no convergence after tsset
Date   Mon, 9 Oct 2006 14:13:53 +0200

Dear list, 

I am having a problem with a heckman selection model for panel data. First
stata 9 estimated it without problems after 34 iterations

	heckman y x x x, select (y=x x x)

but then I needed to 

	tsset

my data in order to create a lagged variable. After this, the same heckman
command as above did not work out anymore 

	(no convergence achieved). 

I am wondering now, why this is the case and if/how it influences my
estimation of the heckman model, because after I typed

	sort year

the model could again be estimated.

Thank you very much for your help. 

Laura
________________________________________________

Laura Seelkopf
Kanzleistr. 1 - 78462 Konstanz
Tel: 07531/3659644 


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