CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Main test results
chapter
Cyril Cleverdon
Michael Keen
Cranfield
An investigation supported by a grant to Aslib by the National Science Foundation.
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
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Ioo
95
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._1 55
...1
[OCRerr] 4s
40
35
30
25
20
is
i0
5
5 I0
%
t5
\
X I. la (Fig. 4.140T)
1.2a (Fig. 4,200T)
r-1 1.3a (Fig. 4.201T)
--[OCRerr] I. Sa (Fig. 4.202T)
O 1.6a (Fig. 4.203T)
[OCRerr]7 1.7a (Fig. 4.204T)
<[OCRerr] l. Sa (Fig. 4.205T)
I. ga (Fig. 4.206T)
20 25 30 35 40 45 $O 55 60 65 70 75 BO B5 90 95 IOO
°/o PRECISION
\
FIGURE 4.207P
PLOT OF RESULTS FOR INDEX LANGUAGES I. la, 1.2a,
1.3a, I. Sa, 1.6a, I. Ta, I. Sa and 1.9a for 42 QUESTIONS
ON 200 DOCUMENT COLLECTION.