IRS13 Scientific Report No. IRS-13 Information Storage and Retrieval 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-15 C0LLECTI0[OCRerr] DICTIONARY EVALUATION ABSTRACT TITLE MEASURE Stem Normed. Recall .8954 .8145 IRE-3 Normed. Precision .6746 .5547 3[OCRerr] Thesaurus-2 Normed. Recall .9191 .8436 Requests (Harris 2) Normede Precision .7072 .5945 Thesaurus-3 Normed. Recall .9268 .8430 (Harris 3) Normed. Precision .7382 .6068 CRAN-l Stem Normed. Recall . 864[OCRerr] .8112 [OCRerr]2 Normede Precision .6704 .6185 Requests Thesaurus-3 Normed. Recall .8833 .8374 (Harris) Normed. Precision .6955 .6420 Suffix `5' Normed. Recall .7253 .6435 Normed. Precision .4997 .4209 Stem Normed. Recall .7601 .6722 ADI Normed. Precision .5326 .4537 35 Thesaurus-i Normed. Recall .8016 .7324 Requests (Harris) Normed. Precision .6069 .5462 Thesaurus-2 Normed. Recall .7548 .6877 (Hastie) Normed. Precision .5190 .4649 Performance Results comparing abstracts with titles for nine dictionaries on three collections, using normalized recall and precision. Figure 5.