IRS13 Search Matching Functions 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. 0 Overlop, Logicol1 Stem X[OCRerr]X Cosine1 Logicol, Stem Precision 1.0 0.8 0.6 0.4 0.2 Overlap1 Logical, Thesaurug 0 X[OCRerr]X Cosine, Logical, Thesaurus- Precision 1.0 0.8 0.6 0.4 0.2 I I I [OCRerr] Recall 1.0 0 0.2 0.4 0.6 0.8 Cranfield-l, Abstracts, 42 Requests I I I I I [OCRerr] Recc 1.0 0 0.2 0.4 0.6 0.8 Cranfield-l, Abstracts, 42 Requests Performance curves comparing cosine and overlap correlation coefficients using two dictionaries, Cran-l Collection. Fig. 5