Finding negation signals and their scope in text is an important subtask in information extraction. In this paper we present a machine learning system that finds the scope of negation in biomedical texts. The system combines several classifiers and works in two phases. To investigate the robustness of the approach, the system is tested on the three subcorpora of the BioScope corpus representing different text types. It achieves the best results to date for this task, with an error reduction of 32.07% compared to current state of the art results.
Morante and Daelemans REF developed a two-phase approach to detect the scope of negation in biomedical literature.
A Metalearning Approach to Processing the Scope of Negation
CoNLL
Computer Science