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      Finite sample behavior of two step estimators in selection models 

      Fernández Sainz, Ana Isabel; Rodríguez Poo, Juan M.; Villanúa Martín, Inmaculada (1999-04)
      The problem of specification errors in sample selection models has received considerable attention both theoretically and empirically. However, very few is known about the finite sample behavior of two step estimators. In ...