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st: Compare models for panel data with xtreg fixed effects
From
Madalina Constantin <[email protected]>
To
[email protected]
Subject
st: Compare models for panel data with xtreg fixed effects
Date
Thu, 4 Jul 2013 23:45:02 -0700 (PDT)
I want to compare my models in STATA 12 in order to select the best one. I first run a base model with control variables only, then introduce each independent variable individually and finally run a full model with all variables.
The problem is that I can not compare them. The AIC-test is only for comparing maximum likelihood models. But for xtreg with random effects this is not an option. Neither does there exist a R-squared which I can interpret.
Here an example of my regressions:
xtreg div_int_change sales_log risk roa_t1 year_d1 year_d2 year_d3 year_d4 year_d5 , re
xtreg div_int_change ceo_change sales_log risk roa_t1 year_d1 year_d2 year_d3 year_d4 year_d5 , re
xtreg div_int_change ceo_change ex_change tmt_sz_change sales_log risk roa_t1 year_d1 year_d2 year_d3 year_d4 year_d5,re
Is there any possibility to test the model fit respectively to say if the full model is better than the other models?
Thank you.
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