Jenny:
Have a look at the thread started with: http://www.stata.com/statalist/archive/2006-10/msg00196.html
and continued at http://www.stata.com/statalist/archive/2006-10/msg00198.html
HTH,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
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--- Jenny S�ve-S�derbergh wrote:
I have data on individuals either selecting funds for their portfolio or not
selecting funds(1 /0 variable). For those who did select funds, I have an
ordinal variable representing the choice of a high, medium or low risk fund
(risk=1,2,3). I am interested only in the choice of portfolio risk, but I want
to control for the possible selection arising from not everyone selecting
funds. Therefore I want to simultaneously estimate an ordinal logit model and a
Heckman selection model.
Would anyone know how I can do this? Would it be possible just to do a probit
equation on the first choice, calculate the Mills ratio, and then include these
in the ordinal probit?
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