On Sun, 1 Dec 2013, Giuseppe Vittucci wrote:

Wooldridge introduces time dummies ("separate year intercept"):

Bingo!

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  Riccardo (Jack) Lucchetti
  Dipartimento di Scienze Economiche e Sociali (DiSES)

  Universitą Politecnica delle Marche
  (formerly known as Universitą di Ancona)

  r.lucchetti@univpm.it
  http://www2.econ.univpm.it/servizi/hpp/lucchetti
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