Hello everyone,

I have an urgent problem. I am investigating the implications of CEO´s political ideology and Corporate Strategic Change using Panel Data. I use a GEE to do so, which is common practice for these type of analysis and it is also approved by my supervisor. The problem I have is that as soon as I include year and industry dummies in my GEE regression, no Wald Chi2 is calculated. I use the following code:

Code:
xtset co_per_rol fyear
xtgee leading_strategic_change ceo_conservatism industry_control pre_entry ceo_tenure firm_age performance firm_size employees ceo_duality ceo_age incentive_compensation democratic_president  liberal_state i.fyear i.sic_industry, vce(robust)
The results that I get are attatched as a PDF file Array .

Could any of you please help me and tell me if either my model or the code I am using is wrong?

Thank you very much in advance,

Richard