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Issue No. 03 - July-Sept. (2014 vol. 5)
ISSN: 1949-3045
pp: 217-226
Thin Nguyen , Centre for Pattern Recognition and Data Analytics (PRaDA), Deakin University
Dinh Phung , Centre for Pattern Recognition and Data Analytics (PRaDA), Deakin University
Bo Dao , Centre for Pattern Recognition and Data Analytics (PRaDA), Deakin University
Svetha Venkatesh , Centre for Pattern Recognition and Data Analytics (PRaDA), Deakin University
Michael Berk , Centre for Pattern Recognition and Data Analytics (PRaDA), Deakin University
ABSTRACT
A large number of people use online communities to discuss mental health issues, thus offering opportunities for new understanding of these communities. This paper aims to study the characteristics of online depression communities (CLINICAL) in comparison with those joining other online communities (CONTROL). We use machine learning and statistical methods to discriminate online messages between depression and control communities using mood, psycholinguistic processes and content topics extracted from the posts generated by members of these communities. All aspects including mood, the written content and writing style are found to be significantly different between two types of communities. Sentiment analysis shows the clinical group have lower valence than people in the control group. For language styles and topics, statistical tests reject the hypothesis of equality on psycholinguistic processes and topics between two groups. We show good predictive validity in depression classification using topics and psycholinguistic clues as features. Clear discrimination between writing styles and contents, with good predictive power is an important step in understanding social media and its use in mental health.
INDEX TERMS
Communities, Mood, Blogs, Feature extraction, Media, Process control, Pragmatics
CITATION

T. Nguyen, D. Phung, B. Dao, S. Venkatesh and M. Berk, "Affective and Content Analysis of Online Depression Communities," in IEEE Transactions on Affective Computing, vol. 5, no. 3, pp. 217-226, 2014.
doi:10.1109/TAFFC.2014.2315623
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