SP500215 Appendix A: TREC-2 Results Appendix National Institute of Standards and Technology D. K. Harman results - GE Research and Development Center Summary Statistics Run Number gecrd2-full, automatic 1 Num of Queries 50 Total number of documents over all queries 0.8 Retrieved: 49261 Relevant: 10489 Rel[OCRerr]ret: 4485 0.6 Recall-Precision Curve Recall Level_Averages Recall Precision 0.00 0.6802 0.10 0.3796 0.20 0.3111 0.30 0.2581 0.40 0.2108 0.50 0.1600 0.60 0.1015 0.10 0.0611 0.80 0.0360 0.90 0.0150 1.00 0.0009 [OCRerr]rage precision over all `vant docs i-interpolated 0.1772 ut Level Averages [OCRerr] Recall [OCRerr]00 0.2109 020 0.2171 2 040 0.3179 060 0.3513 1 080 0.3156 0 100 0.3987 120 0.4178 -1 140 0.4340 160 0.4458 -2 180 0.4559 -3 200 0.4671 Document Level Averages Precision Precision 0.4 At 5 docs 0.4760 At 10 docs 0.4460 0.2 At 15 docs 0.4280 At 20 docs 0.4130 0 0.2 0.4 0.6 0.81 At 30 docs 0.3907 0 At 100 docs 0.2930 At 200 docs 0.2275 Recall At 500 docs 0.1385 At 1000 docs 0.0897 Fallout-Recall Curve R-Precision (precision after R 1 docs retrieved (where R is the number of relevant docu- ments)) 0.8 Exact 0.2342 NORMAL DEVIATE - Fallout-Recall Recall 0.6 - P01 0.84 0.98 0 )[OCRerr]999 0.4 0.98 0.2 0.84 0.5 0 0 0.05 0.1 0.15 0.2 0.16 Fallout x 100 0.02 0.001 -3 -2 -1 0 1 2 3