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Table 4 Retrieval effectiveness when metadata is tagged explicitly for ranked querying.

From: Boolean versus ranked querying for biomedical systematic reviews

Target Method RBP99 P@1,000 R@1,000 P@10,000 R@10,000
Tier 0 A 0.184 0.135 0.159 0.051 0.483
  B 0.115 0.100 0.101 0.044 0.402
Tier 1 A 0.079 0.049 0.343 0.011 0.752
  B 0.036 0.029 0.203 0.009 0.625
Tier 2 A 0.041 0.022 0.442 0.005 0.856
  B 0.014 0.012 0.259 0.004 0.689
  1. In Method A, metadata is indexed separately; Method B searches metadata separately, but also includes it as part of the abstract text. All results are shown for searching from MEDLINE to the Target level indicated. †, ‡ indicate paired t-test with 95 and 98 percent confidence levels respectively (over baseline of TRC queries).