IRS13 Word-Word Associations in Document Retrieval Systems chapter M. E. Lesk Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 0.9 0.8 0.7 0.6 C 0 (0- 0.5 a) 0.4 0.3 0.2 0.1 Thesaurus *-[OCRerr] Stem Null A[OCRerr]A Associations: Freq. 6m100 Cutoff 45 Weight 1.0 n a a a a I I I 0.0 0.l 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Recall Reca11[OCRerr]Precisjon C[OCRerr]rves - Cranfield CollectiQn Comparison of Association and Thesaurus Fig. 13