SP500215 Appendix A: TREC-2 Results Appendix National Institute of Standards and Technology D. K. Harman [OCRerr]su1ts - Mead Data Central, Inc. Run Num be Recall-Precision Curve 50 1 [ Total numb Retrieved: 0.8 Relevant: 10785 Rel[OCRerr]ret:3282j t [OCRerr]ecall Level Averages Recall Precision 0.00 0.4228 0.10 0.1880 0.20 0.1385 0.30 0.1045 0.40 0.0840 0.50 0.0643 0.60 0.0445 0.70 0.0365 0.80 0.0183 0.90 0.0000 1.00 0.0000 age precision over all ant docs interpolated 0.0819 Level Averages t Recall 0 0.1242 0 0.1144 0 0.2072 0 0.2337 0 0.2571 0 0.2740 0 0.2805 0 0.2805 D 0.2805 [OCRerr] 0.2805 [OCRerr] 0.2805 31 2 1 0 Document Level Averages Precision At 5 docs 0.2520 At 10 docs 0.2320 At 15 docs 0.2267 At 20 docs 0.2200 At 30 docs 0.2073 At 100 docs 0.1688 At 200 docs 0.1383 At 500 docs 0.0954 At 1000 docs 0.0656 R-Precision (precision after R docs retrieved (where R is the number of relevant docu- m ents)) Exact 0.1231 NORMAL DEVIATE - Fallout-Recall )01 0.02 0.16 0. 5 0.84 0.98 0 7 0.6 Precision 0.4 0.2 0 1 0.8 0.6 [OCRerr]999 0.4 0.98 0.2 0.84 0.5 0 Recall 0 0.2 0.4 0.6 0.8 Recall Fallout-Recall Curve I I I I -1 0 0.05 0.1 0.15 0.2 0.16 Fallout x 100 -2 0.02 -3 0.001 -3 -2 -1 0 1 2 3