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st: RE: How to set up switching regression model


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: How to set up switching regression model
Date   Wed, 1 Aug 2007 19:34:54 +0200

--- george m hoffman wrote:
> I have a dataset with 24 paired measurements (Y1 and Y2) on 100 subjects. I
> am trying to regress y1 on y2, with the added complication that the y2
> measurement was made with one of two  different instruments, whose identity
> was not recorded with the measurement. So, I have wo sets of measurements
> (y1 and y2a) and (y1 and y2b) on each subject. The instrument was not
> changed within subjects.
> 
> It seems that swithcing regression would help solve this puzzle, but I can't
> set it up correctly in my mind or at the stata keyboard. 

I think a switching regression is more appropriate if y1 were measured with 
one of two instruments. Switching regression is used for cases when the 
explained variable consists of two (or more) unobserved groups. This seems 
more a case of measurement error in the explanatory variable. This doesn't
solve your problem though...

Hope this still helps a bit,
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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