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. enter image description here

  • $\begingroup$ Indicate your dependent variable. $\endgroup$ – Subhash C. Davar Aug 27 '15 at 16:58
  • $\begingroup$ please explain fixed effect assumption. $\endgroup$ – Subhash C. Davar Apr 29 '16 at 17:18

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