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RE: st: Heckman Selection Rule


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Heckman Selection Rule
Date   Fri, 31 Aug 2007 18:05:15 +0100

Still looks like half a reference to me.... 

Nick 
n.j.cox@durham.ac.uk 

georg wernicke
 
> Linders, G. J. M. and H. L. F. de Groot (2006). Estimation of the
> Gravity Equation in the Presence of Zero Flows.

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