Public universities showed better performance as compared to private and this can be explained by the relationship with the socioeconomic status of the student; Valensexplains this finding as a potential bias in the selection of the students admitted to public institutions because of the stringent admission criteria where only the best are usually admitted.
Valens explica este hallazgo por un posible sesgo de selección de los estudiantes admitidos en instituciones oficiales debido a sus intensos procesos de admisión, donde solamente los mejores aspirantes logran un cupo.