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Table 9 Comparison of effectiveness of different retrieval approaches: Boolean only systems (Original and Simplified), ranked only retrieval (TRC queries), ordered simplified Boolean queries (Lucene), combined approach (simplified Boolean queries on Ovid and ranked querying using Zettair).

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 0.026 0.026 0.179 0.004 0.266
(Orig) Tier 2 0.009 0.010 0.202 0.001 0.285
Boolean Tier 1 0.015 0.014 0.103 0.007 0.426
(Simp) Tier 2 0.008 0.006 0.115 0.003 0.414
Ranked Tier 1 0.067 0.044 0.327 0.011 0.709
(TRC) Tier 2 0.036 0.019 0.409 0.004 0.784
Boolean Tier 1 0.023 0.023 0.172 0.013 0.528
(Lucene) Tier 2 0.008 0.007 0.197 0.004 0.577
Combined Tier 1 0.084 0.057 0.415 0.011 0.677
  Tier 2 0.048 0.028 0.532 0.004 0.765