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. v-4i COLLECTION DICTIONARY EVALUATION ABSTRACT INDEDCING MEASURE Stem Normed. Recall .8644 .8897 Normed. Precision .67o4 .6831 CRAN-l Thesaurus-i Normed. Recall .8602 .8629 42 (Old Q.S.) Normede Precision .6319 .6335 Requests Thesaurus-2 Normed. Recall .8864 .8992 (N[OCRerr]w Q.S.) Normed. Precision .6864 .7094 Performance results comparing abstracts with indexing, on three dictionaries, using normalized recall and precision. Figure 27.