<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="31">
<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>
C
0
(0
a)
0.9
Q8
0.7
0.6
0.5
0.4
0.3
0.2
0.I
Minimum Freq. Maximum Freq.
6 25
6 50
6 `00
МОМ>A
8 I I I I I I I I I
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Recoil
Recall-Precision Curves for Association Runs - Cranfield Collection
Variation of Maximum Frequency
Fig. 7
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</PAGE>
</DOC>