Data set is composed of three columns:
The first column (DRUG
contains the names of medical product,
the second column (EVENT
the medical terms of adverse reaction (AR).
Each event is reported exactly once
alone with the list of medical products prescribed to a patient at the point of
event, say ``Rosinex & Ganclex,''
and the list of medical terms describing adverse events, say ``Nausea.''
Then the third column (N
the frequency of events reported with the same list of products and AR's.
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