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-4 Word Stems Appearing in Collection Distinct Concepts Average More Than One and Text in Words Per Thesaurus Concept Dictionary Words Thesaurus Concepts Total Percent IRE-3 Thesaurus-2 *5,477 511 10.72 45i 8.2% IRE-3 Thesaurus-3 *5,477 686 7.98 159 i 2.9% CRAN-1 Thesaurus-i 3,291 377 8[OCRerr]73 155 i 4.7% CRAN-1 Thesaurus-2 3,291 495 6.65 389 I 11.8% + CRA[OCRerr]-2 Thesaurus-3 *7,449 736 10.1 78 1.1% ADI Thesaurus-i 8,099 541 14.97 54 I 0.7% ADI Thesaurus-SAl 8,099 289 28.02 416 I 5.1% ____________________________________________________________________ I * Estimated Values + Data for Cran-1 Use of this Thesaurus are not available. Grouping Characteristics of Seven Thesaurus Dictionaries Fig. 1