SP500207 Description of the PRC CEO Algorithm for TREC chapter P. Thompson National Institute of Standards and Technology Donna K. Harman Top ranked evaluation Run number: 1 Num[OCRerr]queries: 50 Total number of documents over all queries Retrieved: 10000 Relevant: 3901 Rel ret: 1867 RecalF- Precision Averages: at0.00 0.5419 at 0.10 0.3684 at0.20 0.3239 at0.30 0.2848 at0.40 0.1975 atOSO 0.1490 at 0.60 0.0933 at0.70 0.0575 at 0.80 0.0147 at0.90 0.0029 at 1.00 0.0006 Average precision for all points 11-ptAvg: 0.1850 Average precision for 3 intermediate points (0.20, 0.50, 0.80) 3-pt Avg: 0.1625 Recall: Exact: at Sdocs: at 15 docs: at 30 docs: at 100 docs: at 200 docs: Precision: Exact: 0.1867 At Sdocs: 0.2360 Atl5docs: 0.2920 At30docs: 0.2853 AtlOOdocs: 0.2234 At200docs: 0.1867 0.5400 0.0270 0.0890 0.1592 0.3603 0.5400 Figure 2. Post-TREC summary results with 11-point average weights and additional relevance judgments 340