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 Minimum Freq. Maximum Freq. 3 50 0.8 6 50 0.7 I0 50 0.6 C .20.5 (0 a) Q4 0.3 0.2 0.I I fl I I I I U I I I 0.0 0.1 0.2 0.3 0.4 Q5 0.6 0.7 0.8 0.9 1.0 Recoil Recall-Precision Curves for Association Runs - Cranfield Collection Variation of Minimum Frequency Fig. 6