The Fourth International Symposium on Languages in Biology and Medicine (LBM 2011)

Sumithra Velupillai attended The Fourth International Symposium on Languages in Biology and Medicine (LBM 2011) at the Nanyang Technological University in Singapore, December 14-15.

At LBM 2011, Sumithra presented the paper Automatic Classification of Factuality Levels – A Case Study on Swedish Diagnoses and the Impact of Local Context. In this paper, The Stockholm EPR Diagnosis-Factuality Corpus is described and used for building automatic classifiers. The classifier obtains promising results (best overall results are 0.699 average F-measure using all classes, 0.762 F-measure using merged classes), using simple local context features. Preceding context is more useful than posterior, although best results are obtained using a window size of 4. Lower levels of certainty are more problematic than higher levels, which was also the case for the human annotators in creating the corpus. A manual error analysis shows that conjunctions and other higher-level features are common sources of errors.

Happy LBM 2011 participants after a wonderful banquet at Chef Chan's Restaurant

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