SP500207 Vector Expansion in a Large Collection chapter E. Voorhees Y-W. Hou National Institute of Standards and Technology Donna K. Harman Top ranked evaluation Run number: Ium~queries: Total number of Retrieved: Relevant: Rel[OCRerr]ret: Recall - Precision Averages: at 0.00 0.7524 at 0.10 0.4670 at 0.20 0.3242 at 0.30 0.1973 at 0.40 0.1179 at 0.50 0.0672 at 0.60 0.0241 at 0.70 0.0000 at 0.80 0.0000 at 0.90 0.0000 at 1.00 0.0000 Average precision for all 11-pt Avg: 0.1773 siemsl all 50 documents 9992 16400 3393 Recall: at 5 docs: at 15 docs: at 30 docs: at 100 docs: at 200 docs: Precision: 0.0131 0.0344 0.0650 0.1687 0.2564 over all queries points At 5 docs: 0.5200 At 15 docs: 0.4827 At 30 docs: 0.4687 At 100 docs: 0.4100 At 200 docs: 0.3393 Table 2: Official Evaluation Results 348