Dear all,

I have a question regarding my research into the influence of political factors on economical development accros 30 countries over 30 years
My regression is now as follows: Y= a +b1*left + b2*right + b3*center +b4*president+ b5*parliament + e
Am I right I can actually include all dummy's in one regression like this? And how can I account for only time fixed effect (as within countries most will stay the same)

Thanks.