IRS13 Appendix A: Recall-Precision Tables appendix Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. A-iS Cosine Logical Correlation Abstract Stem Thesaurus -l R ? R P 0.1 0.7931 0.1 0.8222 0.2 0.6294 0.2 0.6767 0.3 0.5252 0.3 0.5780 0.4 0.4535 o.4 0.4958 0.5 0.3967 0.5 0.4322 0.6 0.3533 0.6 0.3972 0.7 0.3129 0.7 0.31480 0.8 0.2740 o.8 0.2972 0.9 0.2346 0.9 0.2515 1.0 0.1873 1.0 0.1933 [OCRerr] REC= 0.2299 RNK REC= 0.2341 LOG PRE= 0.3635 LOG PRE 0.3652 NOR REC 0.7546 NOR REC= 0.8043 NOR PRE 0.5221 NOR PRE 0.5823 Overlap Logical Correlation Text Su££ix `5' R P 0.1 0.7936 0.2 0.6383 0.3 0.5065 o.4 0.4412 0.5 0.3970 0.6 0.3625 0.7 0.3120 0.8 0.2562 0.9 0.2271 1.0 0.1912 RNK RFC= 0.2208 LOG PRE= 0.3581 NOR REC 0.7546 NOR PRE 0.5097 Stem Thesaurus-i Thesaurus-SAl R P R P R P 0.1 0.7795 0.1 0.7326 0.1 0.7508 0.2 0.6201 0.2 0.5284 0.2 0.5278 0.3 0.5222 0.3 0.4173 0.3 0.14059 o.4 0.4555 0.14 0.3523 o.4 0.3259 0.5 0.4032 0.5 0.2937 0.5 0.2660 0.6 0.3684 0.6 0.2559 0.6 0.2296 0.7 0.3171 0.7 0.2260 0.7 0.1983 0.8 0.2620 0.8 0.2012 0.8 0.1750 0.9 0.2094 0.9 0.1708 0.9 0.15514 1.0 0.1646 1.0 0.1371 1.0 0.1346 RNK REC= 0.2000 RNK REC 0.1622 RNK REC= 0.1519 LOG [OCRerr]£-- 0.3523 LOG PRE 0.2948 LOG PRE= 0.2987 NOR REC 0.7434 NOR REC 0.7386 NOR REC 0.6589 NOR PRE= 0.4978 NOR PRE= 0.4350 NOR PRE= 0.3602 I