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...Original article healthc inform res april https doi org hir pissn eissn x analysis of adverse drug reactions identified in nursing notes using reinforcement learning eunjoo jeon youngsam kim hojun park rae woong hyopil shin hyeoun ae technology research samsung sds seoul korea institute for cognitive science college humanities national university department biomedical informatics ajou school medicine suwon sciences graduate linguistics objectives electronic health records ehrs based surveillance systems are being actively developed detecting adrs but this is hindered by the difficulty extracting data from unstructured study per formed safety temporal difference method reinforce ment td patients adr and non cases admitted to methods hospital were used classification task a model was estimate state values indicat ing risk each phrase encoded into one seven states estimated during training employed subsequent testing phase we applied logistic regression overall accuracy comparable results...