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. VII-52 Hierarchy-3, Collection Thesaurus-3 `1Parents" and Relevant Relevant Request Rank Document Corr. Rank Document Corr. 24 221 .2911 1 221 .4233 IRE-3 58 080 .2275 10 080 .3095 Q006 65 126 .2210 16 126 .2506 5 rel. 86 28B .2032 34 079 .2112 397 079 .0550 37 28B .2108 Normed. Recall .8413 Normed. Recall .9786 Normed. Precision .4012 Normed. Precision .7394 Hierarchy-3 Thesaurus-3 11A11 Relations'1 106 200 .2448 1 106 .7853 IRE-3 153 106 .2044 3 382 .7448 QOlS 189 382 .1815 14 85A .6516 6 rel. 283 71H .1390 47 200 .5203 301 85A .1315 94 71H .3916 669 72+ .0000 492 72+ .0647 Normed. Recall .6382 Normed. Recall .8649 Normed. Precision .2141 Normed. Precision .6480 Retrieval Results of Two Individual Non-Staff Prepared Requests Comparing Thesaurus with Hierarchy Fig. 31