<DOC>
<DOCNO> IRS13 </DOCNO>
<TITLE> Scientific Report No. IRS-13 Information Storage and Retrieval </TITLE>
<SUBTITLE> Search Matching Functions </SUBTITLE>
<TYPE> chapter </TYPE>
<PAGE CHAPTER="3" NUMBER="44">
<AUTHOR1> E. M. Keen </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>
111-44
Request Q 1[OCRerr]7
8 request concepts, sum of weights 108, sum of squares of
weights 1584.
Cosine MATCHING CONCEPTS DOCUMENT CONCEPTS
Rank Document Numeric Sum of Sum of Sum of
Total wts. in Doc.Wts. Total Sum of Squares oi
Correlation Doct. x Reqwts Weights
Weights
42C R .4421 3 180 3312 48
984 35,424
2 921 .4305 4 156 2736
71 1116 25,488
3 779 e4109 3 192 3456 67 1344
44,64o
4 699 e4081 180
5 3600 61 1308 49,104
5 797 R e3679 5 216 3744 109 2136
65,376
6 34A e3565 5 204 3600 60
1476 64,368
7 916 * 3468 6 132 2160 62 1056 24,480
8 794 R .3444 156 3024
3 io4 1824 48,672
9 683 .3355 4 204 3168 1764 66,96o
77
10 793 R .3325 4 132 2160
54 1020 26,640
15 879 .2896 4 60 864 17
276 5,616
17 795 R .2665 4 48 720 26
336 4, 6o8
27 316 2147 4 6o 864
43 612 10,224
32 33H .2082 6 120
1728 63 1344 43,488
34 672 .1979 4 48 720 40 552 8,352
40 415 .1655 4 48 720
57 780 11,952
43 796 R 1492 4 6o 1008 79 1296 28,800
R = Helevant Document
Normalized Recall = 0.9459
Normalized Precision = 0.7610
Results of a single request using numeric vectors and cosine correlation
Figure 28
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