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Re: st: -heckman- and the identifying variable(s)


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -heckman- and the identifying variable(s)
Date   Mon, 15 Oct 2007 14:03:29 +0100 (BST)

--- Louis Boakye-Yiadom <L.Boakye-Yiadom@bath.ac.uk> wrote:
> When using the -heckman- command, is there a way of checking the 
> validity of the identifying variable(s)? 

No, that is the big problem with every type of "causal" model, in the
end they rely on assumptions you just have to believe. Descriptive
models are in that sense much more scientific. 

-- Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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