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Beyond Knowledge Tracing: Modeling Skill Topologies with Bayesian Networks

  • Tanja Käser
  • Severin Klingler
  • Alexander Gerhard Schwing
  • Markus Gross
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8474)

Abstract

Modeling and predicting student knowledge is a fundamental task of an intelligent tutoring system. A popular approach for student modeling is Bayesian Knowledge Tracing (BKT). BKT models, however, lack the ability to describe the hierarchy and relationships between the different skills of a learning domain. In this work, we therefore aim at increasing the representational power of the student model by employing dynamic Bayesian networks that are able to represent such skill topologies. To ensure model interpretability, we constrain the parameter space. We evaluate the performance of our models on five large-scale data sets of different learning domains such as mathematics, spelling learning and physics, and demonstrate that our approach outperforms BKT in prediction accuracy on unseen data across all learning domains.

Keywords

Bayesian networks parameter learning constrained optimization prediction Knowledge Tracing 

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Tanja Käser
    • 1
  • Severin Klingler
    • 1
  • Alexander Gerhard Schwing
    • 1
    • 2
  • Markus Gross
    • 1
  1. 1.Department of Computer ScienceETH ZurichSwitzerland
  2. 2.Department of Computer ScienceUniversity of TorontoCanada

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