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Table 11 Effectiveness of different retrieval methods, including using ranked only and hybrid ranked and Boolean, on the Misc dataset. Lucene results are over 12 queries.

From: Boolean versus ranked querying for biomedical systematic reviews

Method Level RBP99 P@1,000 R@1,000 P@10,000 R@10,000
Boolean Tier 1 0.065 0.070 0.151 0.010 0.250
(Orig) Tier 2 0.032 0.027 0.262 0.003 0.350
Boolean Tier 1 0.015 0.060 0.200 0.011 0.500
(Simp) Tier 2 0.005 0.020 0.310 0.004 0.560
Ranked Tier 1 0.060 0.072 0.185 0.023 0.516
(TRC) Tier 2 0.036 0.030 0.306 0.007 0.645
Boolean Tier 1 0.070 0.040 0.116 0.030 0.319
(Lucene) Tier 2 0.029 0.015 0.150 0.007 0.404
Combined Tier 1 0.055 0.065 0.200 0.028 0.485
  Tier 2 0.020 0.026 0.300 0.006 0.553