SP500215 Appendix A: TREC-2 Results Appendix National Institute of Standards and Technology D. K. Harman ,ults - Cornell University Summary Statistics Run Number crnlL2-full, automatic 1 Num of Queries 50 Total number of documents over all queries Retrieved: 50000 Relevant: 10785 Rel[OCRerr]ret: 8224 ecall Level_Averages Recall Precision 0.00 0.7756 0.10 0.5381 0.20 0.4732 0.30 0.4321 0.40 0.3959 0.50 0.3585 0.60 0.2991 0.70 0.2357 0.80 0.1705 0.90 0.0904 1.00 0.0148 age precision over all ant docs interpolated 0.3258 Level Averages t Recall Po 0.4533 0 0.5983 *0 0.6796 10 0.7287 0 0.7634 0 0.7838 .0 0.7864 0 0.7864 10 0.7864 0 0.7864 0 0.7864 Document Level Averages Precision At 5 docs 0.5640 At 10 docs 0.5460 At 15 docs 0.5373 At 20 docs 0.5210 At 30 docs 0.4933 At 100 docs 0.4406 At 200 docs 0.3852 At 500 docs 0.2600 At 1000 docs 0.1645 R[OCRerr]Precision (precision after R docs retrieved (where R is the number of relevant docu- ments)) Exact 0.3641 NORMAL DEVIATE - Fallout-Recall Ol 0.02 0.98 0 0.4 0.2 2 0.98 1 0.84 0 0.5 0 Recall-Precision Curve 1 0.8, 0.6 Precision 0.4 0.2 I I 0 1 0.8 0.6 Recall 0 0.2 0.4 0.6 0.8 1 Recall Fallout-Recall Curve I I I 0 0.05 0.1 0.15 0.2 -1 0.16 Fallout x 100 -2 0.02 -3 0.001 -3 -2 -1 0 1 2 3