First Author:   Sergio Da Silva Department of Economics, Federal University of Santa Catarina professorsergiodasilva@gmail.com         Second Author: Dinorá De Faveri State University of Santa Catarina dinora.faveri@udesc.br         Third Author: Ana Correa Federal University of Santa Catarina analuizec@gmail.com         Fourth Author: Raul Matsushita Department of Statistics, University of Brasilia raulmta@unb.br