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RE: st: Heckman Selection Rule

From	"Nick Cox" <[email protected]>
To	<[email protected]>
Subject	RE: st: Heckman Selection Rule
Date	Fri, 31 Aug 2007 18:05:15 +0100

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

Nick 
[email protected] 

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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References:
- Re: st: Heckman Selection Rule
  - From: "georg wernicke" <[email protected]>

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