Automatic assessment of students' free-text answers with different levels

Wen Juan Hou, Jia Hao Tsao

研究成果: 雜誌貢獻文章

4 引文 斯高帕斯(Scopus)

摘要

For improving the interaction between students and teachers, it is fundamental for teachers to understand students' learning levels. An intelligent computer system should be able to automatically evaluate students' answers when the teacher asks some questions. We first built the assessment corpus from the course in the university. With the corpus, we applied the following procedures to extract the relevant information and then built the feature model: (1) remove the punctuation and decimal numbers because it plays the noise roles, (2) apply the part-of-speech tagging such that the syntactic information is extracted, (3) for grouping the information, take the stemming and normalization procedure to sentences, and (4) extract other features. In this study, we treated the assessment problem as the classifying problem, and tried two kinds of classification strategies: two and three classifying classes. For two classes, we got an average of 66.3% precision rate at first. When adding n-gram concept to the feature model, the system reached to the average of 71.9% precision rate which increased performance by 5.6%. The same tendency emerged for three-class experiment. The experiments with SVM show exhilarating results and some improving efforts will be further made in the future.

原文英語
頁(從 - 到)327-347
頁數21
期刊International Journal on Artificial Intelligence Tools
20
發行號2
DOIs
出版狀態已發佈 - 2011 四月 1

ASJC Scopus subject areas

  • Artificial Intelligence

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