Proceedings of the 8th International Workshop on Semantic Evaluation (SemEval 2014) 2014
DOI: 10.3115/v1/s14-2074
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NILC_USP: An Improved Hybrid System for Sentiment Analysis in Twitter Messages

Abstract: This paper describes the NILC USP system that participated in SemEval-2014 Task 9: Sentiment Analysis in Twitter, a re-run of the SemEval 2013 task under the same name. Our system is an improved version of the system that participated in the 2013 task. This system adopts a hybrid classification process that uses three classification approaches: rule-based, lexiconbased and machine learning. We suggest a pipeline architecture that extracts the best characteristics from each classifier. In this work, we want to … Show more

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Cited by 16 publications
(10 citation statements)
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“…Moreover, their system combined three classification methods: machine learning, rule-based, and lexicon-based. Balage Filho and Pardo [51] used the SentiStrength lexicon and the SVM classifier as a machine learning method. The results obtained from the experiments showed that a hybrid system outperformed the individual classifiers, achieving an Fmeasure of 0.56 compared to 0.14, 0.448, and 0.49 obtained by the rule-based, lexicon-based, and SVM classifiers respectively.…”
Section: Twitter Sentiment Analysis Using Hybrid Methodsmentioning
confidence: 99%
“…Moreover, their system combined three classification methods: machine learning, rule-based, and lexicon-based. Balage Filho and Pardo [51] used the SentiStrength lexicon and the SVM classifier as a machine learning method. The results obtained from the experiments showed that a hybrid system outperformed the individual classifiers, achieving an Fmeasure of 0.56 compared to 0.14, 0.448, and 0.49 obtained by the rule-based, lexicon-based, and SVM classifiers respectively.…”
Section: Twitter Sentiment Analysis Using Hybrid Methodsmentioning
confidence: 99%
“…It uses the lexicon classification through a predefined dictionary and classifies that data using machine learning methods. Most commonly used hybrid techniques include pSenti [14], SAIL [15], NILC_USP [16] and Alchemy API [17] as discussed in detail by [18]. In this research, Support Vector Machine (SVM) is selected for sentiment analysis of two pre classified sets of tweet.…”
Section: Introductionmentioning
confidence: 99%
“…Hybrid approaches differ in the circumstances under which lexical analysis or machine learning is preferred [19], [20] or the priority (i.e. weight) that each method is assigned if their individual performance is taken into account [21], [22]. Following this line of research, our hybrid approach utilizes the advantages of both, lexical analysis and machine learning, although giving priority to traditionally more successful lexical approach.…”
Section: Related Workmentioning
confidence: 99%