ISR11
Scientific Report No. ISR-11 Information Storage and Retrieval
Information Analysis and Dictionary Construction
chapter
G. Salton
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.
IV-39
Full Null Harris Two Harris Three
0.1 0.9563 0.1 0.9551 0.1 0.9735
0.2 0.861[OCRerr]8 0.2 0.8242 0.2 0.8973
0.3 0.7986 0.3 0.7389 0.3 o.8245
0.7381 o.4 0.6796 0.4 0.7551
0.5 0.6371 0.5 0.6070 0.5 0.7146
0.6 0.5589 0.6 0.5702 0.6 0.6499
0.7 0.7 0.5233 0.7 0.6012
0.8 0.4086 0.8 0.IL,821 0.8 0.5514
0.9 0.3426 0.9 0.4452 0.9 0.4973
1.0 0.2613 1.0 0.3951 1.0 0.i!118
F~CISI0N
1.0
0.9
0.8
0.7
0.6
0.5
o.4
0.3
ffl[OCRerr] __ _
[OCRerr][OCRerr]K¼[OCRerr]¾
II _
[OCRerr][OCRerr]Q¼
- - _-_ y¼½
[OCRerr]`
_ _ [OCRerr]#
0.2
0.1
0
.1 .2 .3 .4 .5 .6 .7 .8 .9 1.0 RECALL
Comparison Based on Thesauruses
(averages over 17 search requests)
11