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-39 Number of Requests with Collection Rank of First Relevant and Input Dictionary _______ ________ _________ 1-2 3-10 > 11 Thesaurus-3 30 2 2 IRE-3 Phrases 30 2 2 Abstracts Hierarchy - Parents 30 3 1 Hierarchy - All Relations 32 2 CRAN-l Thesaurus[OCRerr]3:b 27 10 5 Abstract Phrases 26 11 5 ADI Thesaurus-l 21 9 5 Text Phrases 20 9 6 * This results differs slightly from that given in Fig. 16 because the present comparison requires the use of output that assigns a slightly different rank in cases of tied rank positions. Comparison of Individual Request Merit giving the Number of Requests Achieving Three Ranges of Rank Position to the Best Ranked Relevant, comparing Thesaurus with Phrases, and Thesaurus with Hierarchy Fig. 27