Classification and Pattern Discovery of Mood in Weblogs Authors(s): Thin Nguyen, Dinh Phung, Brett Adams, Truyen Tran, Svetha Venkatesh
Abstract:
Automatic data-driven analysis of mood from text is an emerging problem with many potential applications. Unlike generic text categorization, mood classification based on textual features is complicated by various factors, including its context- and user-sensitive nature. We present a comprehensive study of different feature selection schemes in machine learning for the problem of mood classification in weblogs. Notably, we introduce the novel use of a feature set based on the affective norms for English words (ANEW) lexicon studied in psychology. This feature set has the advantage of being computationally efficient while maintaining accuracy comparable to other state-of-the-art feature sets experimented with. In addition, we present results of data-driven clustering on a dataset of over 17 million blog posts with mood groundtruth. Our analysis reveals an interesting, and readily interpreted, structure to the linguistic expression of emotion, one that comprises valuable empirical evidence in support of existing psychological models of emotion, and in particular the dipoles pleasure-displeasure and activation-deactivation.
The classification and pattern discovery of sentiment in weblogs will be a high priority for some topic maps.
Detection of teenagers who post to MySpace about violence for example.
Questions:
- How would you use this technique for research on weblogs? (3-5 pages, no citations)
- What other word lists could be applied to research on weblogs? Thoughts on how they could be applied? (3-5 pages, citations)
- Does the “mood” of a text impact its classification in traditional schemes? How would you test that question? (3-5 pages, no citations)
Additional resources:
Affective Norms for English Words (ANEW) Instruction Manual and Affective Ratings
ANEW Message: Request form for ANEW word list.