Raphael F. Lucena Federal University of Ceará (UFC)   Rua Seize Rosado, 1514 Mossoró, Rio Grande do Norte 59614-230 Brazil   raphaelucena@alu.ufc.br   https://caen.ufc.br/pt/           JEL Areas: C1 : Econometric and Statistical Methods: General I3 : Welfare and Poverty: General