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. Overlap, Logical1 Stem Cosine1 Logical, Stem x Overlap, Logical, Thesaurus 0 Cosine1 Logical,Thesaurus- K Precision Precision 1.0 1.0 0.8 0.8 -x K 0.6 0.6 0.4 0.4 0.2 0.2 IRE-3 B I I [OCRerr][OCRerr]%f[OCRerr][OCRerr]Recall 34 Requests IIII Re 0 0.2 0.4 0.6 0.8 1.0 0 0.2 0.4 0.6 0.8 1.0 Performance curves comparing cosine and overlap correlation coefficients using two Dictionaries, IRE-3 Collection Fig. 4