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Table 3 Effectiveness of different ranked queries on two sub-sets of MEDLINE corresponding to different stages of the systematic review process.

From: Boolean versus ranked querying for biomedical systematic reviews

Index Target Query RBP99 P@500 R@500 P@10,000 R@10,000
Tier 0 Tier 1 T 0.215 0.149 0.565 0.104 0.684
   TR 0.261 0.195 0.713 0.136 0.885
   TRC 0.301 0.209 0.747 0.139 0.895
Tier 0 Tier 2 T 0.090 0.066 0.553 0.043 0.690
   TR 0.121 0.082 0.748 0.052 0.926
   TRC 0.148 0.090 0.819 0.053 0.944
     P@50 R@50 P@150 R@150
Tier 1 Tier 3 T 0.249 0.381 0.440 0.265 0.705
   TR 0.280 0.411 0.495 0.297 0.847
   TRC 0.290 0.445 0.518 0.310 0.872
  1. Index indicates the source of documents, while Target indicates the relevant documents that the evaluation is based on. Given Tier 1 was smaller set of documents than Tier 0, we used smaller thresholds for the evaluation.