ABSTRACT
We explore the role negation and speculation identification plays in the multi-label document-level classification of medical reports for diseases. We identify the polarity of assertions made on noun phrases which reference diseases in the medical reports. We experiment with two machine learning classifiers: one based upon Lucene and the other based upon BoosTexter. We find the performance of these systems on document-level classification of medical reports for diseases fails to show improvement when their input is enhanced by the polarity of assertions made on noun phrases. We conclude that due to the nature of our machine learning classifiers, information on the polarity of phrase-level assertions does not improve performance on our data in a multilabel document-level classification task.
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Index Terms
- Does negation really matter?
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