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dc.contributor.authorAppel, Orestesen
dc.contributor.authorChiclana, Franciscoen
dc.contributor.authorCarter, Jennyen
dc.contributor.authorFujita, Hamidoen
dc.date.accessioned2017-02-27T16:02:17Z
dc.date.available2017-02-27T16:02:17Z
dc.date.issued2017
dc.identifier.citationAppel, O., Chiclana, F., Carter, J. and Fujita, H. (2017) Cross-ratio uninorms as an effective aggregation mechanism in Sentiment Analysis. Knowledge-Based System, 124, pp. 16-22en
dc.identifier.urihttp://hdl.handle.net/2086/13339
dc.descriptionThe file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.en
dc.description.abstractThere are situations in which lexicon-based methods for Sentiment Analysis (SA) are not able to generate a classification output for specific instances of a given dataset. Most often, the reason for this situation is the absence of specific terms in the sentiment lexicon required in the classification effort. In such cases, there were only two possible paths to follow: (1) add terms to the lexicon (off-line process) by human intervention to guarantee no noise is introduced into the lexicon, which prevents the classification system to provide an immediate answer; or (2) use the services of a word-frequency dictionary (on-line process), which is computationally costly to build. This paper investigates an alternative approach to compensate for the lack of ability of a lexicon-based method to produce a classification output. The method is based on the combination of the classification outputs of non lexicon-based tools. Specifically, firstly the outcome values of applying two or more non-lexicon classification methods are obtained. Secondly, these non-lexicon outcomes are fused using a uninorm based approach, which has been proved to have desirable compensation properties as required in the SA context, to generate the classification output the lexicon based approach is unable to achieve. Experimental results based on the execution of two well-known supervised machine learning algorithms, namely Na\"{i}ve Bayes and Maximum Entropy, and the application of a cross-ratio uninorm operator are presented. Performance indices associated to options (1) and (2) above are compared against the results obtained using the proposed approach for two different datasets. Additionally, the performance of the proposed cross-ratio uninorm operator based approach is also compared when the aggregation operator used is the arithmetic mean instead. It is shown that the combination of non lexicon-based classification methods with specific uninorm operators improves the classification performance of lexicon-based methods, and it enables the offering of an alternative solution to the SA classification problem when needed. The proposed aggregation method could be used as well as a replacement of ensemble averaging techniques commonly applied when combining the results of several machine learning classifiers' outputs.en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectCross-ratio Uninormsen
dc.subjectSemantic Orientation Aggregationen
dc.subjectHybrid Sentiment Analysisen
dc.subjectSupervised Machine Learningen
dc.subjectNaïve Bayesen
dc.subjectMaximum Entropyen
dc.titleCross-ratio uninorms as an effective aggregation mechanism in Sentiment Analysisen
dc.typeArticleen
dc.identifier.doihttps://dx.doi.org/10.1016/j.knosys.2017.02.028
dc.researchgroupCentre for Computational Intelligenceen
dc.peerreviewedYesen
dc.funderN/Aen
dc.projectidN/Aen
dc.cclicenceCC-BY-NC-NDen
dc.date.acceptance2017-02-25en
dc.researchinstituteInstitute of Artificial Intelligence (IAI)en


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