1. Department of Economics and Informatics, Federal Rural University of Pernambuco, Avenue Gregório Ferraz Nogueira, S/N – José Tomé de Souza Ramos, 569090-535 Serra Talhada, PE, Brazil
2. Federal Institute of Education, Science and Technology of Paraíba, Campus Patos, PB. Acesso Rodovia PB 110, S/N Alto Tubiba – CEP: 58700-030 Patos, PB, Brazil
3. Department of Statistics and Informatics, Federal Rural University of Pernambuco, Rua Dom Manuel de Medeiros, S/N Dois Irmãos – CEP: 52171-900 Recife PE, Brazil