CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Test Environment
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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.Co - o rdinat ion
Search Rules
Precision
Device
Document
Relevance
Recall Exhaus[OCRerr]
Device tivity
1.1 1
2
3
1.2 1
2
3
1.3 1
2
3
1.5 1
2
3
1.6 1
2
3
5+
B [ C D
A
1 [OCRerr]. 1-3
R P R P
9 17 7 37
19 Ii 14 22 15 31
20 9 16 18 16 26
9 16 7 35 8 51
22 12 15 22 16 32
23 9 17 18 18 25
10 17 8 36 8 51
23 11 17 22 17 29
25 8 19 17 19 23
11 9 8'16 10 27
25 5 17 10 19 15
30 5 21 8 23 12
15 11 10 21 11 30
27 5 19 9 21 13
30 4 24 8 25 11
R P R P
12 64 7 64
13 65 7 64
16 51 9 55
21 23 11 48
22 21 13 36
1-4
+__~r__.
R P
6 100
6 100
7 82
ii 38
11 36
R P
5 10(
5 I0(
5 7[OCRerr]
L
7 45
R P
16 47
19 47
19 38
19 33
26 27
R P
16 64
23 63
FIGURE 2.10b. THE COMPOSITE TABLE. COORDINATION LEVEL
5+