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Re: st: Heckman Selection Rule


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Heckman Selection Rule
Date   Fri, 31 Aug 2007 14:45:24 +0100 (BST)

--- Seema Bhatia <ler02sb@reading.ac.uk> wrote:
> I am trying to be as non subjective as possible.

A more practical attitude is to start from the following questions:

o What do I want to know?
o What information do I need for that?
o What information do I have in my dataset?
o What information do I (need to) add using assumptions/theory?

These kinds of models are inherently subjective, so trying to be as
"non-subjective as possible" is not very productive. 

-- 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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