A system for identifying named entities in biomedical text: how results from two evaluations reflect on both the system and the evaluations

Authors: Dingare Shipra¹; Nissim Malvina¹; Finkel Jenny²; Manning Christopher²; Grover Claire¹

Source: Comparative and Functional Genomics, Volume 6, Numbers 1-2, February 2005 , pp. 77-85(9)

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Abstract:

We present a maximum entropy-based system for identifying named entities (NEs) in biomedical abstracts and present its performance in the only two biomedical named entity recognition (NER) comparative evaluations that have been held to date, namely BioCreative and Coling BioNLP. Our system obtained an exact match F-score of 83.2% in the BioCreative evaluation and 70.1% in the BioNLP evaluation. We discuss our system in detail, including its rich use of local features, attention to correct boundary identification, innovative use of external knowledge resources, including parsing and web searches, and rapid adaptation to new NE sets. We also discuss in depth problems with data annotation in the evaluations which caused the final performance to be lower than optimal. Copyright © 2005 John Wiley & Sons, Ltd.

Keywords: automatic named entity recognition; manual annotation of biomedical texts

Document Type: Miscellaneous

DOI: http://dx.doi.org/10.1002/cfg.457

Affiliations: 1: Institute for Communicating and Collaborative Systems, University of Edinburgh 2 Buccleuch Place, Edinburgh EH8 9LW, UK 2: Department of Computer Science, Stanford University, Gates Building 1A, 353 Serra Mall, Stanford CA 94305-9010, USA

Publication date: 2005-02-01

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A system for identifying named entities in biomedical text: how results from two evaluations reflect on both the system and the evaluations

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