A computational treatment of negation and speculation in natural language

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Sentiment analysis (also known as opinion mining) makes use of methods in computational linguistics and text analysis to determine whether a text (headline, news article, movie review, e-mail message, blog or Twitter post) is mostly objective or subjective and, if the latter, whether positive or negative towards its subject matter. Much progress has been made in the last few years in how to represent and analyze sentiment and opinion, but the interaction of negation, speculation and opinion remains an elusive task. For instance, in the sentence