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Prediction of University Students' Academic Achievement by Linear and Logistic Models

Published online by Cambridge University Press:  10 April 2014

Maria Noel Rodríguez Ayán  and
Maria Teresa Coello García
Maria Noel Rodríguez Ayán*
Affiliation:
Universidad de la República (Uruguay)
Maria Teresa Coello García
Affiliation:
Universidad Complutense de Madrid
*
Correspondence concerning this article should be addressed to Maria Noel Rodríguez Ayán, Facultad de Química, CC 1157, Gral. Flores 2124 CP 11800, Montevideo(Uruguay). Phone/Fax: 5982 – 929-0770. E-mails: mayan@fq.edu.uyand, mnrayan@yahoo.com
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Abstract

University students' academic achievement measured by means of academic progress is modeled through linear and logistic regression, employing prior achievement and demographic factors as predictors. The main aim of the present paper is to compare results yielded by both statistical procedures, in order to identify the most suitable approach in terms of goodness of fit and predictive power. Grades awarded in basic scientific courses and demographic variables were entered into the models at the first step. Two hypotheses are proposed: (a) Grades in basic courses as well as demographic factors are directly related to academic progress, and (b) Logistic regression is more appropriate than linear regression due to its higher predictive power. Results partially confirm the first prediction, as grades are positively related to progress. However, not all demographic factors considered proved to be good predictors. With regard to the second hypothesis, logistic regression was shown to be a better approach than linear regression, yielding more stable estimates with regard to the presence of ill-fitting patterns.

Se estudia el efecto de dos tipos de factores sobre el rendimiento de estudiantes universitarios: variables académicas de rendimiento previo y variables demográficas, mediante modelos lineales y logísticos. El principal objetivo del trabajo es comparar los resultados obtenidos con ambas técnicas estadísticas, para determinar cuál de ellos es más adecuado en términos de ajuste y capacidad predictiva cuando se pretende explicar y predecir el rendimiento académico, en función de variables de rendimiento previo y factores sociodemográficos. Como medida del rendimiento a predecir se empleó el avance en la carrera. Las hipótesis planteadas son: 1) El avance está directamente relacionado con las calificaciones en materias básicas de primer año y con variables demográficas y 2) Los modelos logísticos son más adecuados que los modelos lineales, ya que presentan mayor capacidad predictiva. Los resultados permiten confirmar la primera hipótesis en su primera parte, ya que el rendimiento previo está directa y significativamente asociado al avance en la carrera. Pero se cumple de forma parcial por lo que se refiere al efecto factores demográficos. Con respecto a la segunda hipótesis, la regresión logística mostró ser más adecuada que la lineal, pues arroja estimaciones más estables en relación con la presencia de patrones de mal ajuste.

Keywords

logistic versus linear regressionpredictioncreditsacademic achievementadvance in careerregresión logística versus regresión linealprediccióncréditosrendimiento académicoavance en la carrera
Type
Articles
Information
The Spanish Journal of Psychology , Volume 11 , Issue 1 , May 2008 , pp. 275 - 288
Copyright
Copyright © Cambridge University Press 2008

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