MPQA Opinion Corpus Release Page

By requesting and downloading the MPQA Corpus, the user agrees to the following:

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 1.2

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References

Janyce Wiebe, Theresa Wilson, and Claire Cardie (2005). Annotating expressions of opinions and emotions in language. Language Resources and Evaluation (formerly Computers and the Humanities), volume 39, issue 2-3, pp. 165-210.

The paper describing the contextual polarity annotations and agreement study:

Theresa Wilson, Janyce Wiebe, and Paul Hoffmann (2005). Recognizing Contextual Polarity in Phrase-Level Sentiment Analysis. Proceedings of HLT/EMNLP 2005, Vancouver, Canada.
- The instructions used for annotating contextual polarity are available here.