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. o Overlap, Logical, Stem Cosine, Logical, Stem Precision 1.0 0.8 0.6 0.4 0.2 I I I I I [OCRerr]Recall 0 0.2 0.4 0.6 0.8 l.0[OCRerr] ADI, Text, 35 Requests Overlap, Logical, Thesaurui 0 Cosine, Logical, Thesauru x Precision 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 I I L10[OCRerr] Re( ADI, Text, 35 Requests Performance curves comparing cosine and overlap correlation coefficients using two dictionaries, ADI Text Collection. Fig. 6