Given the problem of school evasion, a problem that impacts educational institutions around the world, this paper presents the application of Bayesian networks to predict the percentage chance of student evasion, in order to assist educational managers in preventing these types of situations. The prediction is performed based on the characteristics of the students, collected from the data base system used by SENAI (Tubarão/SC). It is possible to manipulate these characteristics, by the manager, in order to simulate scenarios to minimize the chances of the student evasion. Through the validation of the results, we have obtained 85.6% of accuracy, which indicates a good performance of the Bayesian network modeled for the system developed.Resumo. Tendo em vista o problema de evasão escolar, problema este que impacta instituições de ensino do mundo inteiro, este artigo apresenta a aplicação de Redes Bayesianas, com o intuito de predizer os percentuais de chance de evasão dos alunos, com o objetivo de auxiliar os gestores educacionais na prevenção destes tipos de situações. A predição é realizada com base nas características dos alunos, coletadas do sistema utilizado pelo SENAI de Tubarão/SC. É possível ainda manipular tais características, por parte do gestor, a fim de simular cenários com o objetivo de minimizar as chances de o aluno evadir. Através da validação dos resultados foi obtido 85,6% de taxa de acerto, o que indica um bom desempenho da rede bayesiana modelada para o sistema desenvolvido.
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