1. Department of Statistics, Universidade de Brasília, Brasilia, Brazil;
2. Faculty of Administration, Accounting and Economics, Universidade Federal de Goias, Goiânia, Brazil;
3. Department of Statistics, Universidade Federal do Amazonas, Manaus, Brazil;
4. School of Industrial Engineering, Pontificia Universidad Católica de Valparaíso, Valparaiso, Chile;
5. Department of Statistics, Universidade Federal de São Carlos, São Carlos, Brazil