IRS13 Document Length 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. EVALUATION NUMBER AND PERCENTAGE* MEASURE USED OF INDIVIDUAL REQUESTS COLLECTION DICTIONARY TO DETERMINE INDEXING ABSTRACT BOTH MERIT SUPERIOR SUPERIOR EQUAL Normed. Recall 25 (6[OCRerr].l%) l[OCRerr] (35.0%) 3 CRAN-l Stem Normed. Precision 20 (51.3%) 19 (P8.7%) 3 [OCRerr]2 Requests Thesaurus-2 Normed. Recall 223 (59.0%) 16 ([OCRerr]l.o%) 3 Normed. Precision [OCRerr] (60.5%) 15 (39.5%) 4 * Percentages exclude requests where both equal. Comparison of individual request merit giving the numbers and percentages of requests favoring indexing and abstracts on two dictionaries according to merit assigned by the normalized evaluation measures. Figure 30.