“…The output could be a probability to fail [49], [54], [58], [60], [63] or a categorical variable indicating that the student was at risk or not [52], [55], [59], [61], [20]. Additionally, several researchers used combined categorical variables with probabilities to present their outputs or added additional contextual information [42], [46], [47], [51], [56], [57], [59], [62]. This categorization of students is not trivial as supplementary information to understand the predictions was seldom provided.…”