CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Simulated ranking and document output cut-off
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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Index
Language
I-I
I-2
I-3
I-5
I-6
I-7
I-8
I~9
Normalised
Recall
67.2
67.7
68.5
65.6
66.9
67.4
67.1
63.5
Index Normalised
Language Recall
HI-1 64.2
III-2 64.5
III-3 62.6
III-4 62.4
III-5 61.7
III-6 61.7
II-1
II-2
II-3
IIr4
II-5
II-6
II-7
II-8
II-9
II-I 0
II-ll
H-12
II-13
H-14
H-15
45.6
49.0
55.2
53, 5
56.3
53.8
55.6
56.8
59.3
64.9
65.1
57.2
58.4
55.0
59.8
IV-I 61.5
IV-2 62.4
IV-3 62.7
IV-4 63. I
FIGURE 5.17T
NORMALISED RECALL FOB CRANFIELD INDEX
LANGUAGES BASED ON AVERAGE OF RATIOS.