TAILIEUCHUNG - Báo cáo khoa học: "Vocabulary Choice as an Indicator of Perspective"

We establish the following characteristics of the task of perspective classification: (a) using term frequencies in a document does not improve classification achieved with absence/presence features; (b) for datasets allowing the relevant comparisons, a small number of top features is found to be as effective as the full feature set and indispensable for the best achieved performance, testifying to the existence of perspective-specific keywords. | Vocabulary Choice as an Indicator of Perspective Beata Beigman Klebanov Eyal Beigman Daniel Diermeier Northwestern University and Washington University in St. Louis beata d-diermeier@ beigman@ Abstract We establish the following characteristics of the task of perspective classification a using term frequencies in a document does not improve classification achieved with absence presence features b for datasets allowing the relevant comparisons a small number of top features is found to be as effective as the full feature set and indispensable for the best achieved performance testifying to the existence of perspective-specific keywords. We relate our findings to research on word frequency distributions and to discourse analytic studies of perspective. 1 Introduction We address the task of perspective classification. Apart from the spatial sense not considered here perspective can refer to an agent s role doctor vs patient in a dialogue or understood as a particular way of thinking about something especially one that is influenced by one s beliefs or experiences stressing the manifestation of one s broader perspective in some specific issue or the state of one s ideas the facts known to one etc. in having a meaningful interrelationship stressing the meaningful connectedness of one s stances and pronouncements on possibly different Accordingly one can talk about say opinion on a particular proposed legislation on abortion within pro-choice or pro-life perspectives in this case perspective essentially boils down to opinion in a particular debate. Holding the issue constant but relaxing the requirement of a debate on a specific document we can consider writings from pro- and con- perspective in for example the death penalty controversy over a course of a period of time. Relaxing the issue specificity somewhat Google English Dictionary one can talk about perspectives of people on two sides of a conflict this is not .

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