The Statistical Package for the Social Sciences software SPSS version 15.0 and R version 2.14.0 was used.
Fueron utilizados los softwares Statistical Package for the Social Sciences SPSS versión 15.0 y R versión 2.14.0.
Foram utilizados os softwares Statistical Package for the Social Sciences SPSS versão 15.0 e R versão 2.14.0.