When Less is More: Relevance Feedback Falls Short and Term Expansion Succeeds at HARD 2005

@inproceedings{Diaz2005WhenLI,
  title={When Less is More: Relevance Feedback Falls Short and Term Expansion Succeeds at HARD 2005},
  author={Fernando Diaz and James Allan},
  booktitle={TREC},
  year={2005}
}
We used clarification forms to study passage term feedback. When compared against pseudo-relevance feedback with an extremely large external corpus, we found that passage feedback resulted in a reduction in performance while term feedback significantly improved recall. 

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