This study uses data from Colombia’s 2003 Encuesta de Calidad de Vida to examine how well do electricity strata (proxy for socioeconomic status) explain the choice decision for type of institution and session attended. In the model of choice by type – private vs. public universities – I find that as the electricity strata increases, the marginal probability of enrolling in a public university decreases up to stratum five after which the decreasing trend reverts. In the case of session attendance, the working variable plays an important role in the decision. As expected, if students work and study at the same time, it is difficult to be enrolled as a full-time student.