<DOC> <DOCNO> IRS13 </DOCNO> <TITLE> Scientific Report No. IRS-13 Information Storage and Retrieval </TITLE> <SUBTITLE> Word-Word Associations in Document Retrieval Systems </SUBTITLE> <TYPE> chapter </TYPE> <PAGE CHAPTER="9" NUMBER="11"> <AUTHOR1> M. E. Lesk </AUTHOR1> <PUBLISHER> Harvard University </PUBLISHER> <EDITOR1> Gerard Salton </EDITOR1> <COPYRIGHT MTH="December" DAY="" YEAR="1967" BY="National Science Foundation"> Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. </COPYRIGHT> <BODY> Ix-" Frequency 3 4 5-6 7-8 9-10 11-19 20+ all of words 3 19% 10% 11% 13% 16% 14% 15% 14% 4 0% 9% 0% 40% 18% 20% 12% 5-6 12% 33% 16% 22% 19% 21% 7-8 0% 0% 20% 0% 5% 9-10 0% 43% 25% 25% 11-19 50% 29% 33% 20+ 37% 37% Dependence of Word-Pair significance On Word Frequency Table 3 Note: the `all' column shows the percentage of significant correlations among all pairs which have the frequency of their lower frequency word indicated by the row frequency; not the percentage among all pairs with a word of the indicated frequency either as maximum or minimum frequency component. </BODY> </PAGE> </DOC>