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Table 5 Effectiveness of query expansion using MeSH.

From: Boolean versus ranked querying for biomedical systematic reviews

Target Src RBP99 P@1,000 R@1,000 P@10,000 R@10,000
Tier 0 1 0.162 0.124 0.157 0.043 0.449
  2 0.173 0.131 0.160 0.045 0.436
  3 0.179 0.130 0.162 0.045 0.440
Tier 1 1 0.066 0.043 0.320 0.010 0.673
  2 0.069 0.046 0.335 0.010 0.700
  3 0.074 0.045 0.335 0.011 0.682
Tier 2 1 0.035 0.019 0.405 0.004 0.769
  2 0.036 0.020 0.421 0.004 0.790
  3 0.038 0.020 0.416 0.004 0.758
  1. Retrieval is from the full MEDLINE collection, to the Target level indicated. The TRC queries are expanded, using three sources (Src): 1, qualifiers (sub-headings); 2, qualifiers and concept terms; and 3, qualifiers, concept terms, abbreviations, and supplementary terms. POS tagging is applied to detect phrases in the queries. †, ‡ indicate paired t-test with 95 and 98 percent confidence levels respectively (over baseline of TRC queries).