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-47 Large improvement Not large improvement with association with association (rank recall up .1) rank recall in null above .2 10 10 20 rank recall in null below .2 4 18 22 total 14 28 42 Contingency Table for Co-Variation of Association Improvement and Bad Performance in Stem Dictionary Table 14