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Topic Modeling based Interdisciplinarity Measurement in the Informatics Related Journals
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Topic Modeling based Interdisciplinarity Measurement in the Informatics Related Journals
Jin, Seol A; Song, Min;
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This study has measured interdisciplinarity using a topic modeling, which automatically extracts sub-topics based on term information appeared in documents group unlike the traditional top-down approach employing the references and classification system as a basis. We used titles and abstracts of the articles published in top 20 journals for the past five years by the 5-year impact factor under the category of `Information & Library Science` in JCR 2013. We applied `Discipline Diversity` and `Network Coherence` as factors in measuring interdisciplinarity; `Shannon Entropy Index` and `Stirling Diversity Index` were used as indices to gauge diversity of fields while topic network`s average path length was employed as an index representing network cohesion. After classifying the types of interdisciplinarity with the diversity and cohesion indices produced, we compared the topic networks of journals that represent each type. As a result, we found that the text-based diversity index showed different ranking when compared to the reference-based diversity index. This signifies that those two indices can be utilized complimentarily. It was also confirmed that the characteristics and interconnectedness of the sub-topics dealt with in each journal can be intuitively understood through the topic networks classified by considering both the diversity and cohesion. In conclusion, the topic modeling-based measurement of interdisciplinarity that this study proposed was confirmed to be applicable serving multiple roles in showing the interdisciplinarity of the journals.
textmining;topic modeling;scholarly journal;interdisciplinary;diversity index;
 Cited by
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