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UBC Theses and Dissertations
An empirical analysis of lexical polarity and contextual valence shifters for opinion classification Longton, Adam
Abstract
This work is concerned with the automatic understanding of evaluative text. We investigate sentence level opinion polarity prediction by assigning lexical polarities and deriving sentence polarity from these with the use of contextual valence shifters. A methodology for iterative failure analysis is developed and used to refine our lexicon and identify new contextual shifters. Algorithms are presented that employ these new shifters to improve sentence polarity prediction accuracy beyond that of a state-of-the-art existing algorithm in the domain of consumer product reviews. We then apply the best configuration of our algorithm to the domain of movie reviews.
Item Metadata
| Title |
An empirical analysis of lexical polarity and contextual valence shifters for opinion classification
|
| Creator | |
| Publisher |
University of British Columbia
|
| Date Issued |
2008
|
| Description |
This work is concerned with the automatic understanding of evaluative text. We
investigate sentence level opinion polarity prediction by assigning lexical polarities and
deriving sentence polarity from these with the use of contextual valence shifters. A
methodology for iterative failure analysis is developed and used to refine our lexicon and
identify new contextual shifters. Algorithms are presented that employ these new shifters
to improve sentence polarity prediction accuracy beyond that of a state-of-the-art existing
algorithm in the domain of consumer product reviews. We then apply the best
configuration of our algorithm to the domain of movie reviews.
|
| Extent |
1709740 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
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| Date Available |
2009-02-04
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| Provider |
Vancouver : University of British Columbia Library
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| Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
|
| DOI |
10.14288/1.0051409
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| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
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| Graduation Date |
2008-11
|
| Campus | |
| Scholarly Level |
Graduate
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| Rights URI | |
| Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International