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126   Chapter 5 Depression discovery in cancer communities using deep learning






                      Table 5.1 Literature Summary of Lexicon-based methods for sentiment analysis.


                                                                                   Level of
                 Authors Lexicon used          Data set/Source   Polarity  Language granularity
                 Moreo    Taxonomy lexicon designed for News articles  Pos/neg  English  Document level
                   et al.  news analysis
                   [18]
                 Heerschop SentiWordNet        Internet Movie Database Pos/neg  English  Document level
                   et al.
                   [19]
                 Zirn et al. SentiWordNet      The multidomain   Pos/neg   English  Subsentence
                   [21]   Unigram Lexicon, Taboda and  sentiment data set            level
                           Grieve's Turney Adjective  (amazon.com)
                           List
                 Wu and   d                    Twitter           Pos/neg   English  Sentence level
                   Ren [22]
                 Connor   OpinionFinder        Twitter           Pos/neg   English  Sentence level
                   et al.
                   [23]
                 Thet et al. SentiWordNet, domain-specific Movie reviews  Pos/neg,  English  Aspect level
                   [25]    lexicon                                sentiment
                                                                  strength
                 VK Singh  SentiWordNet        Movie reviews     Pos/neg   English  Document and
                   et al.                                                            aspect
                   [27]                                                              levels
                 Nasukawa Novel SA lexicon     Web pages of various  Pos/neg and English  Document and
                   and Yi                        domains          neutral            sentence
                   [28]                                                              levels



                                       In Ref. [27] also, the authors use the SentiWordNet lexicon for a
                                    detailed feature and document-level SA of movie reviews. They
                                    explore the use of “adverb þ verb” and “adverb þ adjective” com-
                                    binations for document-level SA. Feature-level SA is domain spe-
                                    cific. Feature-wise sentiment scores are assigned for all the
                                    features in the text. The mean of the sentiment scores of all the
                                    features represents the final movie review score. Their approach
                                    has two major limitations. Firstly, since the aspect-level imple-
                                    mentation is domain specific, there is a need to change the aspect
                                    vector for different domains. Secondly, this approach cannot
                                    handle the latent or hidden aspects.
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