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. IX-9 Cutoff Significance No. of Pairs .6-[OCRerr]7 15.6% 185 .7-.8 16.0% 75 .8-. 9 17.3% 52 .9-1 20.0% 20 all 16.2% 332 Effect of Correlation Level on Significance Table 2 50 200 Number of pairs (right scale) [OCRerr]l80 40 1601 Significance (left scale) 140 30 120 100 20 80 60 10 40 20 0 0 I I I I I I I i[OCRerr] i[OCRerr] .6 .7 .8 .9 Variation of Significance with Cutoff Fig. 2