--- 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/
-----------------------------------------
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
