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Table 6 Results of the 2006 and 2007 TREC topics with and without query expansion as measured by mean rank precision

From: Evaluation of query expansion using MeSH in PubMed

TREC Query expansion P@5 P@10 P@20
2006 Yes 0.622 0.616 0.621
  No 0.613 0.592 0.584
2007 Yes 0.538 0.525 0.503
  No 0.566 0.548 0.519
  1. Retrieved documents are sorted under the TF-IDF weighting scheme