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1.  Computational Semantics in Clinical Text Supplement 
Biomedical Informatics Insights  2013;6(Suppl 1):1-2.
doi:10.4137/BII.S11868
PMCID: PMC3702198  PMID: 23847421
2.  What’s In a Note: Construction of a Suicide Note Corpus 
This paper reports on the results of an initiative to create and annotate a corpus of suicide notes that can be used for machine learning. Ultimately, the corpus included 1,278 notes that were written by someone who died by suicide. Each note was reviewed by at least three annotators who mapped words or sentences to a schema of emotions. This corpus has already been used for extensive scientific research.
doi:10.4137/BII.S10213
PMCID: PMC3500150  PMID: 23170067
natural language processing; computational linguistics; corpus; suicide
3.  Sentiment Analysis of Suicide Notes: A Shared Task 
Biomedical informatics insights  2012;5(Suppl 1):3-16.
This paper reports on a shared task involving the assignment of emotions to suicide notes. Two features distinguished this task from previous shared tasks in the biomedical domain. One is that it resulted in the corpus of fully anonymized clinical text and annotated suicide notes. This resource is permanently available and will (we hope) facilitate future research. The other key feature of the task is that it required categorization with respect to a large set of labels. The number of participants was larger than in any previous biomedical challenge task. We describe the data production process and the evaluation measures, and give a preliminary analysis of the results. Many systems performed at levels approaching the inter-coder agreement, suggesting that human-like performance on this task is within the reach of currently available technologies.
PMCID: PMC3299408  PMID: 22419877
Sentiment analysis; suicide; suicide notes; natural language processing; computational linguistics; shared task; challenge 2011

Results 1-3 (3)