Multilingual Sentiment and Subjectivity Analysis ACL 2012

107 Pages·2012·4.42 MB·English

ACL 2012
Multilingual Sentiment and
Subjectivity Analysis

Rada Mihalcea, University of North Texas
Carmen Banea, University of North Texas
Janyce Wiebe, University of Pittsburgh
What is subjectivity and sentiment analysis?
—  Subjectivity and sentiment analysis focuses on the automatic
identification of private states in natural language (Wiebe et al.,
2005)

“ ”
I love Jeju Island.

Subjectivity Subjective Objective
Analysis
Sentiment Positive Negative Neutral ---
Analysis

Top Ten Languages on the Web
Other
18%
Russia English
3% 27%
Korean
2%
Portughese
4%
Arabic
3% German
4%
Chinese
French
Japanese Spanish
23%
3%
5% 8%
internetworldstats.com, March, 2011
Overview
—  I. Sentiment and subjectivity analysis
—  Definitions, Applications
—  II. Sentiment and subjectivity analysis on English
—  Lexicons, Corpora, Tools
—  III. Word- and phrase-level annotations
—  IV. Sentence level annotations
—  V. Document level annotations
—  VI. What works, what doesn’t
Some slides have been adapted from tutorials/lectures given by Carmen Banea,
Bing Liu, Janyce Wiebe
I. Sentiment and subjectivity analysis

Definitions & Applications
What is subjectivity?
’
—  The linguistic expression of somebody s opinions,
sentiments, emotions, evaluations, beliefs, speculations
(private states)
—  Private state: state that is not open to objective observation
or verification

Quirk, Greenbaum, Leech, Svartvik (1985). A Comprehensive Grammar of the
English Language.

—  Subjectivity analysis classifies content in objective or
subjective