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.
- 155 -
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4O
30
20
0
X 4. 701"1
O 4. 700T
"[" 4. 702T
/x 4. 703T
I0 20 30 40 50 60 70 80 90
I00
% PRECISION
FIGURE 4.715P
SIMPLE CONCEPT INDEX LANGUAGES II.l.a,
II.2.a, II.3.a, and II.4.a (FIGURES 4,700T -
4. 703T)
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40 x.
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Io
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FIGURE 4.716P
Jr J
X 4. 701T
O 4. 705T
4. 706T
30 40 SO 60 °/o PRECISION
70 80 90 I00
SIMPLE CONCEPT INDEX LANGUAGES II.2.a,
II.6.a and II.7.a (FIGURES 4.701T, 4,705T
and 4. 706T)
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