Matrix analysis and applied linear algebra
Matrix analysis and applied linear algebra
Information visualization in data mining and knowledge discovery
Information visualization in data mining and knowledge discovery
Modern Information Retrieval
Toward Measuring Visualization Insight
IEEE Computer Graphics and Applications
Glosser: Enhanced Feedback for Student Writing Tasks
ICALT '08 Proceedings of the 2008 Eighth IEEE International Conference on Advanced Learning Technologies
Using Intelligent Feedback to Improve Sourcing and Integration in Students' Essays
International Journal of Artificial Intelligence in Education
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Many approaches have been proposed for providing feedback in academic writing, however, few of them are visually based. We describe a novel visualisation method for providing feedback to support formative essay assessment. The visualisation method makes use of text mining techniques to provide insight on the semantics of the topics in an essay. We propose that visualisation can be used to mitigate many of the problems associated with the subjectivity of formative essay assessment. The visualisation method involves a process of non-negative matrix factorisation (NMF), to uncover topics in an essay, followed by multidimensional scaling, to map the essay topics to a 2-dimensional representation. We evaluate our approach with a subset of the British Academic Written English corpus of 2761 assignments written by university students.