Towards well-grounded phrase-level polarity analysis

  • Authors:
  • Robert Remus;Christian Hänig

  • Affiliations:
  • Department of Computer Science, University of Leipzig, Leipzig, Germany;Department of Computer Science, University of Leipzig, Leipzig, Germany

  • Venue:
  • CICLing'11 Proceedings of the 12th international conference on Computational linguistics and intelligent text processing - Volume Part I
  • Year:
  • 2011

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Abstract

We propose a new rule-based system for phrase-level polarity analysis and show how it benefits from empirically validating its polarity composition through surveys with human subjects. The system's twolayer architecture and its underlying structure, i.e. its composition model, are presented. Two functions for polarity aggregation are introduced that operate on newly defined semantic categories. These categories detach a word's syntactic from its semantic behavior. An experimental setup is described that we use to carry out a thorough evaluation. It incorporates a newly created German-language data set that is made freely and publicly available. This data set contains polarity annotations at word-level, phrase-level and sentence-level and facilitates comparability between different studies and reproducibility of our results.