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Dark Web pp 203-225 | Cite as

Affect Analysis

  • Hsinchun ChenEmail author
Chapter
Part of the Integrated Series in Information Systems book series (ISIS, volume 30)

Abstract

Analysis of affective intensities in computer-mediated communication is important in order to allow a better understanding of online users’ emotions and preferences. Despite considerable research on textual affect classification, it is unclear which features and techniques are most effective. In this chapter, we compared several feature representations for affect analysis, including learned n-grams and various automatically and manually crafted affect lexicons. We also proposed the support vector regression correlation ensemble (SVRCE) method for enhanced classification of affect intensities. SVRCE uses an ensemble of classifiers, each trained using a feature subset tailored toward classifying a single affect class. The ensemble is combined with affect correlation information to enable better prediction of emotive intensities. Experiments were conducted on four test beds encompassing web forums, blogs, and online stories. The results revealed that learned n-grams were more effective than lexicon-based affect representations. The findings also indicated that SVRCE outperformed comparison techniques, including Pace regression, semantic orientation, and WordNet models. Ablation testing showed that the improved performance of SVRCE was attributable to its use of feature ensembles as well as affect correlation information. A case study was conducted to illustrate the utility of the features and techniques for affect analysis of large archives of online discourse of US and Middle Eastern extremists.

Keywords

Support Vector Regression Feature Subset Sentiment Analysis Affect Intensity Pointwise Mutual Information 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of Management Information SystemsUniversity of ArizonaTusconUSA

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