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[RsR] robust regression and fixed effects models

Hello:?
I am using R 3.0.2. ??

I have panel data on countries' renewable energy net generation (and installed capacity) over time. ?I am regressing these dependent variables on various socioeconomic variables, as well as binary policy variables. ?I have have done basic OLS, but I wanted to explore both fixed effects models, as there are likely significant country effects and robust regression, as Q-Q plots indicate that there are some strong outliers. ?This might be a question of apples and oranges, but how do I compare the goodness of fit of the fixed effects models with the robust regression models? ?
Any help would be appreciated.?