SP500215 NIST Special Publication 500-215: The Second Text REtrieval Conference (TREC-2) Combination of Multiple Searches chapter E. Fox J. Shaw National Institute of Standards and Technology D. K. Harman Table 9: Average Precision and Exact R-Precision for the five individual runs compared with the combined CombSUM runs (Routing Topics 51-100). Average non-interpolated Precision [Run [[ AP-3 [OCRerr] PATN-3 SJM-3 ZF-3 II Disk 3 sV 0.1347 0.0189 0.1139 0.0593 0.0589 LV 0.1189 0.0156 0.1056 0.0587 0.0494 Pnl.0 0.2519 0.0257 0.2128 0.1141 0.2039 Pnl.5 0.2869 0.0239 0.2411 0.1189 0.2279 Pn2.0 0.2852 0.0221 0.2390 0.1303 0.2225 CombSUM 0.3196 0.0260 0.2696 0.1304 0.2681 Chg/Max 11.4% 1.2% 11.8% 0.07% 17.6% _________ Exact_R-Precision _______ _______ [Run [[ AP-3 [OCRerr] PATN-3 [OCRerr] SJM-3 ] ZF-3 II Disk 3 ] sV 0.1703 0.0171 0.1337 0.0595 0.0595 LV 0.1444 0.0156 0.1098 0.0547 0.1002 Pnl.0 0.2790 0.0325 0.2185 0.1224 0.2594 Pnl.5 0.3082 0.0322 0.2579 0.1248 0.2786 Pn2.0 0.3062 0.0310 0.2531 0.1462 0.2809 CombSUM 0.3319 0.0319 0.2900 0.1260 0.3143 Chg/Max 7.7% -1.8% 12.4% -13.8% 11.9% Table 10: Average Precision and Exact R-Precision for the five individual runs (Ad-hoc Topics 101-150). Average non-interpolated Precision Run I'__AP__]_DOE_[OCRerr] Disk 1 _______ ______ fi_______ Disk 2 ZF [OCRerr] oth FR ] WSJ J ZF `1 AP ] FR [OCRerr] WSJ [ `[Disks J sV 0.3237 0.0949 0.0630 0.2740 0.0936 0.3068 0.0650 0.2259 0.1166 0.2035 LV 0.3326 0.0697 0.1018 0.2848 0.0997 0.2981 0.0602 0.2483 0.1045 0.2159 Pnl.0 0.3340 0.0831 0.1777 0.3153 0.1292 0.3133 0.1927 0.2838 0.1722 0.2205 Pnl.5 0.3682 0.0814 0.1874 0.3332 0.1430 0.3438 0.1982 0.2941 0.1964 0.2543 Pn2.0 0.3647 0.0750 0.1761 0.3290 0.1307 0.3419 0.1995 0.2828 0.2018 0.2573 CombSUM 0.4153 0.1038 0.2133 0.3778 0.1657 0.3959 0.2000 0.3561 0.2200 0.3206 Chg/Max 12.8% 9.4% 13.8% 13.4% 15.9% 15.1% 0.2% 21.0% 9% 24.6% _____________________ Exact R-Precision _______ FR [OCRerr] wSJ [ TI 1 [Run I{ 0A33P51 J DOE [Disk 1 [OCRerr] [OCRerr] J ZF [OCRerr] AP ] Disk 2 ZF [OCRerr] DBio$i[OCRerr] [OCRerr] sV 0.0947 0.0567 0.2881 0.1086 0.3052 0.0718 0.2502 0.1130 0.2649 LV 0.3385 0.0714 0.1006 0.3022 0.1055 0.3019 0.0540 0.2712 0.1036 0.2661 Pnl.0 0.3495 0.0989 0.1434 0.3322 0.1190 0.3139 0.1653 0.2934 0.1577 0.2867 Pnl.5 0.3721 0.0899 0.1582 0.3440 0.1277 0.3465 0.1716 0.3044 0.1796 0.3203 Pn2.0 0.3735 0.0925 0.1579 0.3389 0.1154 0.3401 0.1640 0.2953 0.1979 0.3233 CombSUM 0.4137 0.1156 0.1938 0.3757 0.1389 0.3712 0.1741 0.3385 0.1909 0.3711 Chg/Max 10.8% 16.9% 22.5% 9.2% 8.8% 7.1% 1.4% 11.2% -3.5% 14.8% 250