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


From   Louis Boakye-Yiadom <[email protected]>
To   [email protected]
Subject   Re: st: -heckman- and the identifying variable(s)
Date   Mon, 15 Oct 2007 14:18:11 +0100

Thanks. I was hoping there is an equivalent of the Sargan test.

Louis

Quoting Maarten buis <[email protected]>:

--- Louis Boakye-Yiadom <[email protected]> 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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