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"Bag of words" is not enough for strength of evidence classification

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AMIA Annu Symp Proc. 2005:1031.
Abstract: 

Incorporation of evidence from clinical research requires critical appraisal of its quality. Information retrieval systems can facilitate clinicians' judgments by automatically labeling retrieved citations with their strength of evidence categories. Preliminary results of such a text classification experiment involving MEDLINE citations show that a "bag of words" approach is insufficient for accurate classification.

Lin J, Demner-Fushman D. "Bag of words" is not enough for strength of evidence classification AMIA Annu Symp Proc. 2005:1031.