MPQA Opinion Corpus Release Page
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The annotations in this data collection are copyrighted by the MITRE Corporation. User acknowledges and agrees that: (i) as between User and MITRE, MITRE owns all the right, title and interest in the Annotated Content, unless expressly stated otherwise; (ii) nothing in this Agreement shall confer in User any right of ownership in the Annotated Content; and (iii) User is granted a non-exclusive, royalty free, worldwide license (with no right to sublicense) to use the Annotated Content solely for academic and research purposes. This Agreement is governed by the law of the Commonwealth of Massachusetts and User agrees to submit to the exclusive jurisdiction of the Massachusetts courts.
Note: The textual news documents annotated in this corpus have been collected from a wide range of sources and are not copyrighted by the MITRE Corporation. The user acknowledges that the use of these news documents is restricted to research and/or academic purposes only.
Available versions
Version 3.0 (entity/event-level target added)
Version 2.0 (attitude and span-based target added)
Version 1.2 (contextual polarity added)
References
The paper describing the MPQA 3.0 annotation scheme:
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Lingjia Deng and Janyce Wiebe (2015).
MPQA 3.0: Entity/Event-Level Sentiment Corpus.
2015 Conference of the North American Chapter of the Association for Computational Linguistics – Human Language Technologies, Denver, Colorado, USA.
The main paper describing the core annotation scheme:
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Janyce Wiebe, Theresa Wilson, and Claire Cardie (2005).
Annotating expressions of opinions and emotions in language.
Language Resources and Evaluation, volume 39, issue 2-3, pp. 165-210.
The chapter from Theresa Wilson's Dissertation describing the new attitude and target annotations :
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Chapter 7 from Theresa Ann Wilson (2008). Fine-grained Subjectivity and Sentiment Analysis: Recognizing the Intensity, Polarity, and Attitudes of Private States. University of Pittsburgh.
The main paper describing the contextual polarity annotations :
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Theresa Wilson, Janyce Wiebe, and Paul Hoffmann (2005).Recognizing Contextual Polarity in Phrase-Level Sentiment
Analysis. Proceedings of HLT/EMNLP 2005, Vancouver, Canada.
The OpQA papers:
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Veselin Stoyanov, Claire Cardie, Diane Litman, and Janyce Wiebe (2004).Evaluating an Opinion Annotation Scheme Using a New Multi-Perspective Question and Answer Corpus. Working Notes of the 2004 AAAI Spring Symposium on Exploring Attitude and Affect in Text: Theories and Applications.
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Veselin Stoyanov, Claire Cardie, and Janyce Wiebe (2005).Multi-Perspective Question Answering Using the OpQA Corpus.Proceedings of HLT/EMNLP 2005, Vancouver, Canada.