Shan Shaw led discussion of early validation exercises (e.g. mortality prediction from various clinical characteristics)
This led to a discussion of the wholesale representation of the NLP concept derivatives of a data mart within the i2b2 database. This includes a discussion, for example, whether we should store modifiers with concepts or new compound concepts (that bury the explicit modifiers). The most important part of the discussion was the remarkably small contribution that negation seems to have to the performance of the NLP algorithms.
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