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ThinkMind // International Journal On Advances in Life Sciences, volume 4, numbers 3 and 4, 2012 // View article lifsci_v4_n34_2012_7
A Comparison of Automated Keyphrase Extraction Techniques and of Automatic Evaluation vs. Human Evaluation
 Authors:
Richard Hussey
Shirley Williams
Richard Mitchell
Ian Field Keywords: Automated Keyphrase Extraction; C-Value; Comparisons; Document Classification; Human Evaluation; Inverse Document Frequency; NC-Value; Reuters News Corpus; Synonyms; Term Frequency Abstract:
Keyphrases are added to documents to help identify the areas of interest they contain. However, in a significant proportion of papers author selected keyphrases are not appropriate for the document they accompany: for instance, they can be classificatory rather than explanatory, or they are not updated when the focus of the paper changes. As such, automated methods for improving the use of keyphrases are needed, and various methods have been published. However, each method was evaluated using a different corpus, typically one relevant to the field of study of the method’s authors. This not only makes it difficult to incorporate the useful elements of algorithms in future work, but also makes comparing the results of each method inefficient and ineffective. This paper describes the work undertaken to compare five methods across a common baseline of corpora. The methods chosen were Term Frequency, Inverse Document Frequency, the C-Value, the NC-Value, and a Synonym based approach. These methods were analysed to evaluate performance and quality of results, and to provide a future benchmark. It is shown that Term Frequency and Inverse Document Frequency were the best algorithms, with the Synonym approach following them. Following these findings, a study was undertaken into the value of using human evaluators to judge the outputs. The Synonym method was compared to the original author keyphrases of the Reuters’ News Corpus. The findings show that authors of Reuters’ news articles provide good keyphrases but that more often than not they do not provide any keyphrases. Pages: 136 to 153 Copyright: Copyright (c) to authors, 2012. Used with permission. Publication date: December 31, 2012 Published in: journal ISSN: 1942-2660
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