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Thanks a lot for your reply. I tried to include more countries and years one by one in the dummy vaiable. But when I entered the last line, it returned an " Error in sample: illegal date IF" message. What does it mean and how can I continue to enter more lines? smpl @all series dum=0 smpl ...

Dear all, I am working on my dissertation and have problems on creating dummy variables in fixed effects model. My dependent variable is net income inequality (nii) and 3 explanatory variables: GDP(lggdp), GDP squared(lggdp2) and degree of openess(openess). The balanced panel data covers 13 countire...