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Table 5 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 0.556 0.540 0.540
  No 0.523 0.517 0.524
2007 Yes 0.385 0.411 0.413
  No 0.434 0.454 0.452
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