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. SUFFIX `S' z 0 THE SAURUS-3 ¼ PRECISION 1.0 - 0.8 0.6 - 0.4 - 0.2 - I [OCRerr] [OCRerr] j [OCRerr] I a I a `[OCRerr]RECALL 0 0.2 0.4 0.6 0.8 1.0 Comp[OCRerr]rison 28 Cran-l, Abstracts, 42 Requests Evaluation Dictionary Measure Suffix `5' Thesaurus-3 Normed Recall .8717 [OCRerr]837 Normed P[OCRerr]ecision .7018 952 Performance Curves and Table of Normalized Measures Comparing Suffix `5' and Thesaurus Dictionaries on the Cran-l Collection Fig. 10