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st: random effects probit model


From   Duha Al-Kuwari <d.alkuwari@qu.edu.qa>
To   statalist@hsphsun2.harvard.edu
Subject   st: random effects probit model
Date   Wed, 12 Mar 2008 14:08:49 +0000 (GMT)

dear all, good morning 
 
i have a question about  random effect probit model.
 
is it an acceptable to include dummy variables in random effects model. i'm asking this question because i've got strange results when  i added dummy variables to my model  .
 
that is , when i used random effects probit model to test my variables ( before adding dummy variables) as:
 
xtprobit y x1 x2 x3 x4 x5 x6, i(id)
mfx compute, predict (pu0)
 
i've got  significant results. however, when i added dummy variables to the model as:
 
xtprobit y x1 x2 x3 x4 x5 x6 x7  d2 d3  d4 d5, i(id)
mfx compute, predict (pu0)
 
the  results were strange: non of Z values were insignificant, except d3, moreover the Z values of variables wee almost the same  . can any one please help me and tell me whether it is an acceptable to use random effect probit model
 
thanks
 
 
 
 




____________________________
Dr.Duha Al-Kuwari 
Department of Finance and Economics
College of Business and Economics
University of Qatar
P.O. Box 2713
Doha, Qatar
Tel: (+974) 485-1868 
       

 



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