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Authors: Nuno Guimaraes 1 ; Luis Torgo 2 and Alvaro Figueira 1

Affiliations: 1 CRACS - INESC TEC, Portugal ; 2 LIADD - INESC TEC, Portugal

Keyword(s): Sentiment Lexicon, Lexicon Expansion, Twitter Sentiment Analysis.

Abstract: In sentiment analysis the polarity of a text is often assessed recurring to sentiment lexicons, which usually consist of verbs and adjectives with an associated positive or negative value. However, in short informal texts like tweets or web comments, the absence of such words does not necessarily indicates that the text lacks opinion. Tweets like ”First Paris, now Brussels... What can we do?” imply opinion in spite of not using words present in sentiment lexicons, but rather due to the general sentiment or public opinion associated with terms in a specific time and domain. In order to complement general sentiment dictionaries with those domain and time specific terms, we propose a novel system for lexicon expansion that automatically extracts the more relevant and up to date terms on several different domains and then assesses their sentiment through Twitter. Experimental results on our system show an 82% accuracy on extracting domain and time specific terms and 80% on correct polari ty assessment. The achieved results provide evidence that our lexicon expansion system can extract and determined the sentiment of terms for domain and time specific corpora in a fully automatic form. (More)

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Paper citation in several formats:
Guimaraes, N. ; Torgo, L. and Figueira, A. (2016). Lexicon Expansion System for Domain and Time Oriented Sentiment Analysis. In Proceedings of the 8th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2016) - KDIR; ISBN 978-989-758-203-5; ISSN 2184-3228, SciTePress, pages 463-471. DOI: 10.5220/0006081704630471

@conference{kdir16,
author={Nuno Guimaraes and Luis Torgo and Alvaro Figueira},
title={Lexicon Expansion System for Domain and Time Oriented Sentiment Analysis},
booktitle={Proceedings of the 8th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2016) - KDIR},
year={2016},
pages={463-471},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0006081704630471},
isbn={978-989-758-203-5},
issn={2184-3228},
}

TY - CONF

JO - Proceedings of the 8th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2016) - KDIR
TI - Lexicon Expansion System for Domain and Time Oriented Sentiment Analysis
SN - 978-989-758-203-5
IS - 2184-3228
AU - Guimaraes, N.
AU - Torgo, L.
AU - Figueira, A.
PY - 2016
SP - 463
EP - 471
DO - 10.5220/0006081704630471
PB - SciTePress

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