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Table 2 Effectiveness of different ranked queries in each tier, searching from the full MEDLINE collection.

From: Boolean versus ranked querying for biomedical systematic reviews

Index Target Query RBP99 P@1,000 R@1,000 P@10,000 R@10,000
MEDLINE Tier 0 T 0.043 0.038 0.042 0.021 0.202
   TR 0.092 0.079 0.088 0.040 0.380
   TRC 0.166 0.124 0.155 0.046 0.461
   B 0.150 0.118 0.143 0.044 0.408
MEDLINE Tier 1 T 0.010 0.009 0.064 0.004 0.296
   TR 0.024 0.021 0.161 0.008 0.575
   TRC 0.067 0.044 0.327 0.011 0.709
   B 0.053 0.040 0.284 0.010 0.676
MEDLINE Tier 2 T 0.003 0.003 0.082 0.001 0.283
   TR 0.008 0.008 0.195 0.003 0.601
   TRC 0.036 0.019 0.409 0.004 0.784
   B 0.019 0.014 0.341 0.004 0.718
  1. Index indicates the source of documents, while Target indicates the relevant documents that the evaluation is based on. For example, Tier 1 in the Target column indicates that we judge our system based on the documents that are chosen for full-text screening.