For a recommender system , sentiment analysis has been proven to be a valuable technique. A recommender system aims to predict the preference to an item of a target user. Mainstream recommender systems work on explicit data set.
For example, collaborative filtering works on the rating matrix, and content-based filtering works on the meta-data of the items. In many social networking services or e-commerce websites, users can provide text review, comment or feedback to the items. These user-generated text provide a rich source of user's sentiment opinions about numerous products and items.
Since these features are broadly mentioned by users in their reviews, they can be seen as the most crucial features that can significantly influence the user's experience on the item, while the meta-data of the item usually provided by the producers instead of consumers may ignore features that are concerned by the users. For different items with common features, a user may give different sentiments. Also, a feature of the same item may receive different sentiments from different users. Users' sentiments on the features can be regarded as a multi-dimensional rating score, reflecting their preference on the items.
The first motivation is the candidate item have numerous common features with the user's preferred items,  while the second motivation is that the candidate item receives a high sentiment on its features.
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For a preferred item, it is reasonable to believe that items with the same features will have a similar function or utility. So, these items will also likely to be preferred by the user. On the other hand, for a shared feature of two candidate items, other users may give positive sentiment to one of them while give negative sentiment to another. Clearly, the high evaluated item should be recommended to the user.
Based on these two motivations, a combination ranking score of similarity and sentiment rating can be constructed for each candidate item. Except the difficulty of the sentiment analysis itself, applying sentiment analysis on reviews or feedback also face the challenge of spam and biased reviews. One direction of work is focused on evaluating the helpfulness of each review. Besides, a review can be designed to hinder sales of a target product, thus be harmful to the recommender system even it is well written.
Researchers also found that long and short form of user-generated text should be treated differently. An interesting result shows that short form reviews are sometimes more helpful than long form,  because it is easier to filter out the noise in a short form text. For the long form text, the growing length of the text does not always bring a proportionate increase of the number of features or sentiments in the text.
From Wikipedia, the free encyclopedia. See also: Reputation management , web 2.
See also: Recommender system. Dunphy, and Marshall S. The measurement of psychological states through the content analysis of verbal behavior. Univ of California Press, Proceedings of the Association for Computational Linguistics. Sentiment Classification using Machine Learning Techniques".
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Retrieved 18 November Retrieved Springer Berlin Heidelberg, ACM, Springer International Publishing, Retrieved on Retrieved 10 October Sprenger, Timm; G. Sandner, Philipp; M. Welpe, Isabell Scientific Reports. Bibcode : NatSR Multi-document processing topics expand beyond those of natural language processing to those of multimedia processing, for instance processing the images in, photographs in and layouts of the e-participation documents, slide shows and presentations, generated, utilized and hyperlinked to by individuals and groups.
The topics pertain to the modeling of user contexts, to dialogue systems technology, to digital personal assistants, to digital group assistants, to intelligent tutoring systems and to contextual or task-based information search and retrieval technology. The topics pertain to the planning of, the scheduling of and to the automated planning and scheduling of group tasks, activities and discussion topics. Real-time accurate information and reasoning processes empower individuals, team leaders, groups and communities. With 19, cities in the United States of America and with city governments and journalism organizations in nearly each, there is a market for the services described points 1 to Such service providers could access city resources, including cloud-based, as well as third-party services, such as regional search trends, to inform each individual participant and group, ensuring the quality of e-participation venues, their real-time dashboards, their group discussions, their group reasoning and their democratic processes.
Fact checker , Epistemology. Argumentation Theory , Theory of Justification. Spin , Persuasion , Manipulation , Media Manipulation. Sentiment Analysis. Agenda Building , Agenda Setting.
Cohen, Sarah, James T. Hamilton, and Fred Turner. ACM, Agarwal et al. Wu, You, Pankaj K.
Karën Fort (Author of Collaborative Annotation for Reliable Natural Language Processing)
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