CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Methods for presentation of 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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Coordination
Level
Minus 9
Minus 8
Minus 7
Minus 6
Minus 5
Minus 4
Minus 3
Minus 2
Minus I
Mammum
Heca]l
Ratlo
94.9%
94. 9%
94.9%
94. 7%
~3.7%
8[OCRerr]. [OCRerr]/o
7a. 3%
62.3%
40. 7%
16.9%
Precision
Ratio
O. 9%
1. 0%
i. I%
1.3%
i.67o
2.7%
4.6%
6.0%
8. 97o
22.2%
too
i
'I
i \
\
I
90
80
70
30
2O
I0
0 IO 20 30 40 50 60 70 80 90 I00
% PP, ECISION
60
/
1
U 5o
hJ
rf
[OCRerr]- 40
FIGURE 3.3OTP
TABLE ANrD PLOT FOR RESULTS BY METHOD 4, MAXIMUM
RETRIEVING TERM COORDINATION LEVELS, FOR INDEX
LANGUAGE L 1. a. (INDEX LANGUAGE I. 6. a DOTTED LINE)