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Unranked retrieval evaluation:Precision and Recall

  • Precision: fraction of retrieved docs that are relevant = P(relevant|retrieved)

  • Recall: fraction of relevant docs that are retrieved

  • = P(retrieved|relevant)

  • Relevant

  • Nonrelevant

  • Retrieved

  • tp

  • fp

  • Not Retrieved

  • fn

  • tn

  • Precision P = tp/(tp + fp)
  • Recall R = tp/(tp + fn)

Speaker notes:

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