IRS13 Scientific Report No. IRS-13 Information Storage and Retrieval 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-23 Rank Positions Promoted Demoted Ratio 1-5 16 35 .46 6-9 9 13 .69 10-19 18 16 1.13 20-29 10 7 1.43 30-39 2 2 1.00 40-49 3 7 .43 50-99 10 11 .91 100-199 17 3 5.67 Promotions and Demotions as Function of Rank Positions Table 7