MPQA Opinion Corpus Release Page
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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.
Version 3.0 (entity/event-level target added)
Version 2.0 (attitude and span-based target added)
Version 1.2 (contextual polarity added)
The paper describing the MPQA 3.0 annotation scheme:
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:
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 :
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 :
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:
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.
Veselin Stoyanov, Claire Cardie, and Janyce Wiebe (2005).Multi-Perspective Question Answering Using the OpQA Corpus.Proceedings of HLT/EMNLP 2005, Vancouver, Canada.