<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Unsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus"^^ . "The evaluative character of a word is called its semantic orientation. A positive semantic orientation implies desirability (e.g., \"honest\", \"intrepid\") and a negative semantic orientation implies undesirability (e.g., \"disturbing\", \"superfluous\"). This paper introduces a simple algorithm for unsupervised learning of semantic orientation from extremely large corpora. The method involves issuing queries to a Web search engine and using pointwise mutual information to analyse the results. The algorithm is empirically evaluated using a training corpus of approximately one hundred billion words — the subset of the Web that is indexed by the chosen search engine. Tested with 3,596 words (1,614 positive and 1,982 negative), the algorithm attains an accuracy of 80%. The 3,596 test words include adjectives, adverbs, nouns, and verbs. The accuracy is comparable with the results achieved by Hatzivassiloglou and McKeown (1997), using a complex four-stage supervised learning algorithm that is restricted to determining the semantic orientation of adjectives. "^^ . "2002" . . . . . . . . . . . . "Peter D."^^ . "Turney"^^ . "Peter D. Turney"^^ . . "Michael L."^^ . "Littman"^^ . "Michael L. Littman"^^ . . . . . . "Unsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus (Postscript)"^^ . . . . . . "ERB-1094.ps"^^ . . . "Unsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus (Image (PNG))"^^ . . . . . . "preview.png"^^ . . . "Unsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus (PDF)"^^ . . . . . . . . . "ERB-1094.pdf"^^ . . . "Unsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus (Indexer Terms)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #2322 \n\nUnsupervised Learning of Semantic Orientation from a Hundred-Billion-Word Corpus\n\n" . "text/html" . . . "Artificial Intelligence" . . . "Language" . . . "Machine Learning" . . . "Statistical Models" . .