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Opinion Analysis through Constraint Optimisation

Pandey, Suraj Jung (2011) Opinion Analysis through Constraint Optimisation. MSc by research thesis, University of York.

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Abstract

Opinion lexicon plays a vital role in sentiment classifi�cation. A previous study shows that a compositional model can be e�ective in sentiment classifi�cation. But such a model has been only applied using hand-crafted composition rules. The need for hand-crafted rules arise when dealing with conflicting polarity values within the same phrase. In this thesis, we show that an alternative is to employ a weighted polarity lexicon. There are several key advantages of a weighted polarity lexicon. Firstly, compositionality rules simply become linear sums without requiring conflict resolution rules. Secondly, a weighted polarity lexicon can be automatically learnt from review data using constraint optimisation. Thirdly, instead of providing just a binary positive or negative output, our model can be used to provide a graded overall sentiment. Our experiments show that our model provides state-of-the-art opinion classi�cation.

Item Type: Thesis (MSc by research)
Academic Units: The University of York > Computer Science (York)
Depositing User: Suraj Jung Pandey
Date Deposited: 26 Aug 2011 10:15
Last Modified: 08 Aug 2013 08:46
URI: http://etheses.whiterose.ac.uk/id/eprint/1570

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