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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6O
J
.J
[OCRerr]o
3O
I0 20 30 40 SO 60
°/o PRECISION
i r
4. 707T
O 4. 710T
"l" 4. 713T
A 4. 714T
I
70 80 90 tO0
FIGURE 4.721P
SIMPLE CONCEPT INDEX LANGUAGES If. 8.a,
II.11.a, II.14.a and II.15.a (FIGURES 4.707T,
4.710T, 4.713T and 4.714T}