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Integrating LSA-based hierarchical conceptual space and machine learning methods for leveling the readability of domain-specific texts

Published online by Cambridge University Press:  05 April 2019

Hou-Chiang Tseng ,
Berlin Chen ,
Tao-Hsing Chang  and
Yao-Ting Sung
Hou-Chiang Tseng
Affiliation:
Department of Computer Science and Information Engineering, National Taiwan Normal University, Taipei, Taiwan Research Center for Psychological and Educational Testing, National Taiwan Normal University, Taipei, Taiwan Chinese Language and Technology Center, National Taiwan Normal University, Taipei, Taiwan
Berlin Chen
Affiliation:
Department of Computer Science and Information Engineering, National Taiwan Normal University, Taipei, Taiwan
Tao-Hsing Chang
Affiliation:
Department of Computer Science and Information Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan
Yao-Ting Sung*
Affiliation:
Department of Educational Psychology and Counseling, National Taiwan Normal University, Taipei, Taiwan Institute for Research Excellence in Learning Sciences, National Taiwan Normal University, Taipei, Taiwan
*
*Corresponding author. Email: sungtc@ntnu.edu.tw
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Abstract

Text readability assessment is a challenging interdisciplinary endeavor with rich practical implications. It has long drawn the attention of researchers internationally, and the readability models since developed have been widely applied to various fields. Previous readability models have only made use of linguistic features employed for general text analysis and have not been sufficiently accurate when used to gauge domain-specific texts. In view of this, this study proposes a latent-semantic-analysis (LSA)-constructed hierarchical conceptual space that can be used to train a readability model to accurately assess domain-specific texts. Compared with a baseline reference using a traditional model, the new model improves by 13.88% to achieve 68.98% of accuracy when leveling social science texts, and by 24.61% to achieve 73.96% of accuracy when assessing natural science texts. We then combine the readability features developed for the current study with general linguistic features, and the accuracy of leveling social science texts improves by an even higher degree of 31.58% to achieve 86.68%, and that of natural science texts by 26.56% to achieve 75.91%. These results indicate that the readability features developed in this study can be used both to train a readability model for leveling domain-specific texts and also in combination with the more common linguistic features to enhance the efficacy of the model. Future research can expand the generalizability of the model by assessing texts from different fields and grade levels using the proposed method, thus enhancing the practical applications of this new method.

Keywords

Domain-specific textMachine learningReadabilitySupport vector machineText mining
Type
Article
Information
Natural Language Engineering , Volume 25 , Issue 3 , May 2019 , pp. 331 - 361
Copyright
© Cambridge University Press 2019 

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