Improving Feature Extraction for Pathology Reports with Precise Negation Scope Detection
Olga Zamaraeva | Kristen Howell | Adam Rhine
Proceedings of the 27th International Conference on Computational Linguistics
We use a broad coverage, linguistically precise English Resource Grammar (ERG) to detect negation scope in sentences taken from pathology reports. We show that incorporating this information in feature extraction has a positive effect on classification of the reports with respect to cancer laterality compared with NegEx, a commonly used tool for negation detection. We analyze the differences between NegEx and ERG results on our dataset and how these differences indicate some directions for future work.