I think coefficient of all independent variables should change in same direction, if a fixed effect assumption is used, the following are my results. They change in different direction, what's the problem? By the way, when I add one more control variable (agglomeration effect), the coefficient also change in different direction. It's weird.
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Randel
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Indicate your dependent variable. – Aug 27 '15 at 16:58
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please explain fixed effect assumption. – Apr 29 '16 at 17:18