IRS13 Thesaurus, Phrase and Hierarchy Dictionaries 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. CRAN-l Collection Request Stem Dictionary Thesaurus-3 Dictionary Rank Document Corr. Rank Document Corr. 3 916 Relevant .2564 1 728 Non-relevant .4045 13 921 Relevant .2055 15 919 Relevant .2302 Q167 19 919 Relevant .1784 18 916 Relevant .2107 4 rel. 41 920 Relevant .1267 21 921 Relevant .2052 >41 728 Non-relevant .0289 62 920 Relevant .1375 Normed. Recall .9158 Normed. Recall .8648 Normed. Precision .6028 Normed. Precision .4667 1 34A Relevant .2146 1 316 Non-relevant .4173 13 33}{ Relevant .1304 13 34A Relevant .2494 Q323 43 331 Relevant .0597 29 33[OCRerr] Relevant .1739 5 rel. 65 34+ Relevant .0393 72 331 Relevant .1043 147 879 Relevant .0000 106 34i' Relevant .0685 147 316 Non-relevant .0000 177 879 Relevant .0000 Normed. Recall .7395 Normed. Recall .6082 Normed. Precision .5057 Normed. Precision .2952 Retrieval Results of Four Individual Requests Comparing Stem with Thesaurus Fig. 28 (continued)