SP500207 Description of the PRC CEO Algorithm for TREC chapter P. Thompson National Institute of Standards and Technology Donna K. Harman Run number: prceol all 50 Num~queries: Total number of documents Retrieved: 10000 Relevant: 4056 Rel_ret: 1666 Recall - Precision Averages: at0.00 0.6598 at 0.10 0.4382 at0.20 0.3451 at0.30 0.2536 at0.40 0.1753 atOSO 0.1400 at0.60 0.1016 at0.70 0.0489 at 0.80 0.0185 at 0.90 0.0015 at 1.00 0.0015 Average precision for all points 11-ptAvg: 0.1985 Average precision for 3 3-ptAvg: 0.1679 Recall: over all queries intermediate points (0.20, 0.50, 0.80) at Sdocs: at 15 docs: at 30 docs: at 100 docs: at 200 docs: Precision: 0.0379 0.1193 0.1714 0.3438 0.4557 At Sdocs: 0.4040 At 15 docs: 0.3653 At30docs: 0.3033 AtlOOdocs: 0.2322 At200docs: 0.1666 Figure 1. TREC summary results without weights 339