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I am looking for data sets that I could use to train and benchmark negation detection systems.

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    Negation detection is a good idea in principle -- like a universal translator -- but it has similar problems in practice. Negation is a really complicated matter, and overt negative quantifiers or predicates don't begin to exhaust the topic. – jlawler Jan 31 '17 at 23:59
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Some (all?) datasets from the Automatic Content Extraction (ACE) Program

From Linguistic Data Consortium. "ACE (Automatic Content Extraction) English annotation guidelines for entities." (2005).:

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Unfortunately, it is not available free of charge.

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