TAILIEUCHUNG - Báo cáo khoa học: "Subgroup Detection in Ideological Discussions"

The rapid and continuous growth of social networking sites has led to the emergence of many communities of communicating groups. Many of these groups discuss ideological and political topics. It is not uncommon that the participants in such discussions split into two or more subgroups. The members of each subgroup share the same opinion toward the discussion topic and are more likely to agree with members of the same subgroup and disagree with members from opposing subgroups. | Subgroup Detection in Ideological Discussions Amjad Abu-Jbara EECS Department University of Michigan Ann Arbor MI USA amjbara@ Mona Diab Center for Computational Learning Systems Columbia University New York NY USA mdiab@ Pradeep Dasigi Department of Computer Science Columbia University New York NY UsA pd2359@ Dragomir Radev EECS Department University of Michigan Ann Arbor MI USA radev@ Abstract The rapid and continuous growth of social networking sites has led to the emergence of many communities of communicating groups. Many of these groups discuss ideological and political topics. It is not uncommon that the participants in such discussions split into two or more subgroups. The members of each subgroup share the same opinion toward the discussion topic and are more likely to agree with members of the same subgroup and disagree with members from opposing subgroups. In this paper we propose an unsupervised approach for automatically detecting discussant subgroups in online communities. We analyze the text exchanged between the participants of a discussion to identify the attitude they carry toward each other and towards the various aspects of the discussion topic. We use attitude predictions to construct an attitude vector for each discussant. We use clustering techniques to cluster these vectors and hence determine the subgroup membership of each participant. We compare our methods to text clustering and other baselines and show that our method achieves promising results. 1 Introduction Online forums discussing ideological and political topics are common1. When people discuss a disputed topic they usually split into subgroups. The members of each subgroup carry the same opinion 1 etc 399 toward the discission topic. The member of a subgroup is more likely to show positive attitude to the members of the same subgroup and negative attitude to the members

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