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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