SP500215 Appendix A: TREC-2 Results Appendix National Institute of Standards and Technology D. K. Harman suits - HNC, Inc. Summary Statistics Run Number HNCad1-full, automatic Recall-Precision Curve Num of Queries 50 1 Total number of documents over all queries Retrieved: 50000 0.8 Relevant: 10785 Rel[OCRerr]ret: 6944 0.6 ecall Level Averages Recall Precision 0.00 0.7750 0.10 0.5762 0.20 0.4934 0.30 0.4215 0.40 0.3536 0.50 0.2672 0.60 0.2041 0.70 0.1271 0.80 0.0575 0.90 0.0215 1.00 0.0007 [OCRerr]ge precision over all [OCRerr]nt docs nterpolated 0.2787 Level Averages Recall 0 0.4087 0 0.5261 0 0.5867 0.6272 0.6533 ) 0.6681 ) 0.6720 ) 0.6720 ) 0.6720 Document Level Averages Precision At 5 docs 0.5560 At 10 docs 0.5680 At 15 docs 0.5507 At 20 docs 0.5470 At 30 docs 0.5367 At 100 docs 0.4520 At 200 docs 0.3652 At 500 docs 0.2247 At 1000 docs 0.1389 R-Precision (precision after R docs retrieved (where R Is the number of relevant docu- ments)) Precision 0.4 0.2 0 I I I 0 0.2 0.4 0.6 0.8 Recall Fallout-Recall Curve 1 0.8 Exact 0.3474 0.6 NORMAL DEVIATE Fallout-Recall [OCRerr]1 0.02 0.16 0.84 0.98 0 99 0.4< 2 0.98 0.2 1 0.84 0 0.5 0 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 3 Recall