Journal
JOURNAL OF SYSTEMS AND SOFTWARE
Volume 82, Issue 6, Pages 1036-1045Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jss.2009.01.013
Keywords
Document classification; Email; Resemblance; Nearest-neighbour; Naive Bayes
Funding
- Council of the Hong Kong SAR, China [1198/03E]
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In this paper, we report our experience on the use of phrases as basic features in the email classification problem. We performed extensive empirical evaluation using our large email collections and tested with three text classification algorithms, namely, a naive Bayes classifier and two k-NN classifiers using TF-IDF weighting and resemblance respectively. The investigation includes studies on the effect of phrase size, the size of local and global sampling, the neighbourhood size, and various methods to improve the classification accuracy. We determined suitable settings for various parameters of the classifiers and performed a comparison among the classifiers with their best settings. Our result shows that no classifier dominates the others in terms of classification accuracy. Also, we made a number of observations on the special characteristics of emails. In particular, we observed that public emails are easier to classify than private ones. (c) 2009 Elsevier Inc. All rights reserved.
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