CRANV1P1
ASLIB Cranfield Research Project: Factors Determining the Performance of Indexing Systems: VOLUME 1. Design, Part 1. Text
Formation of Index Languages
chapter
Cyril Cleverdon
Jack Mills
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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100
9O
80
70
60
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lO
0
0
[OCRerr]- = ASTIR (7030 Terms)
.... AEC (12704 Terms)
I I | I I 1 I I I
10 20 30 40 50 60 70 80 90
% of Index Terms
(Ranked by Usage)
100
FIGURE 5.2 PATTERNS OF TERM USAGE
(original
(Original figure taken from 'Centralisation
and Documentation", Arthur D. Little Inc)