st: Biprobit for panel data

[Magdalena Norberg-Sch�nfeldt <Magdalena.Norberg-Schonfeldt@econ.umu.se>]

Hi,
I am quite new to Stata and have alredy run in to 
problems =) (trust me, I am not blaming Stata for 
that...). I have a pair of probits where the 
dependent variable of the second equation is 
included as an explanatory variable in the first 
equation, as I understand it, this is not a 
problem in the biprobit command. I have 
successfully (I hope) alredy estimated the model 
for cross sections whit the robust cluser command 
and found a significant correlation between the 
two equations, but, my problem is that the data 
is an unbalanced panel and I would like to extend 
the model to account for random effects in order 
to actually use the panel structure, and I do 
suspect that there are individual specific 
effects. Is it possible to run biprobit together with an xt command?

And, does anybody have an idea about how  the 
results can be expected to change when using an 
xt command compared to just using robust cluster?

Thanks for your time!
/Magdalena


----------
MAGDALENA NORBERG-SCH�NFELDT
DEPARTMENT OF ECONOMICS � UME� UNIVERSITY � SE-90187 UME� � SWEDEN
TELEPHONE: + 46 90 786 61 46 � FAX: + 46 90 77 23 02
EMAIL: magdalena.n-schonfeldt@econ.umu.se



*
*   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/