IRS13 Evaluation Parameters chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. II-" ADI ABSTRACTS COLLECTIONS, AVERAGES OVER 35 RE[OCRerr]UESTS STEM THESAURUS REC. PREC. REC. FREC. 0.1 0.7963 0.1 0.8788 0.2 0.6350 0.2 0.7567 0.3 0.5283 0.3 [OCRerr] 0.[OCRerr]6O3 O.[OCRerr] 0.5577 0.5 O.[OCRerr]O51 0.5 O.[OCRerr]912 o.6 0.3699 0.6 O.[OCRerr][OCRerr]7O 0.7 0.3383 0.7 0.3893 o.8 0.2996 o.8 0.3287 0.9 0.2568 0.9 0.2726 leo 0.2018 1.0 0.2093 RNK REC = 0.2[OCRerr]15 RNK REC = O.253[OCRerr] LOG PRE = 0.3587 LOG PRE = 0.3837 NOR REC = 0.7652 NOR REC = 0.8045 NOR PRE = 0.5339 NOR PRE = 0.6075 1.0 0.8 Stem C 0.6 Thesaurus 0 0.4 0.2 ¾< I I I I I [OCRerr] 0 0.2 0.4 0.6 0.8 1.0 Recall Results of Two Retrieval Runs, showing the Averages Produced. Fig. 5