CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Supplementary tests and 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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FIGURE 6.12T
Coordination Level 2
Exhaustivity 3
Document Relevance 1-4
Number of Documents in Collection
Number of Relevant Documents 198
20O
Search Rule A
Number of (Questions 42
Generality Figure 23.6
Index Documents Recall
Language Retrieved Ratio
Rel, Non-rel.
Precisiozl Fall -out x
Ratio Ratio
II. l.a 28 27 14.1% 50.9%
II.2.a 44 65 22.2% 40.4%
II.3.a 60 115 30.3% 27.9%
II.4.a 67 255 33.8% 20.8%
II.5.a 81 359 40.9% 18.4%
II.6.a 57 155 28.8% 26.9%
II. 7.a 75 318 37.9% 19.1%
II.8.a 99 605 50.0% 14.1%
II.9.a 75 296 37.9% 20.2%
II.10.a 129 942 65.2% 12.0%
II.11.a 146 1259 73.7% 10.4%
II.12.a. 72 287 36.4% 20.1%
II.13.a 117 937 59.1% 11.1%
II.14.a 143 2047 72.2% 6.5%
II.15.a 168 2590 84.8% 6.1%
0. 329% 18
0. 792% 25
1 890% 32
3 109% 36
4 377% 39
1 890% 33
3 877% 33
7 376% 40
3.609% 33
11.485% 32
15. 350% 41
3.5O0% 34
11.424% 40
24. 957% 40
31. 578% 41
z
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
41 41
i/i
i i
i i!!!¸
FIGURE 6.13T
Coordination Level 4
Exhaustivity 3
Document Relevance 1-4
Number of Documents in Collection
Number of Relevant Documents 198
2OO
Search Rule A
Number of Questions
Generality Fi[OCRerr]u re
Index Documents Recall
Language Retrieved Ratio
Rel. Non-rel.
Precision Fall-out
Ratio Ratio
II. 1.a 0 0
II. 2. a 2 0 1.0% 100% 0. 000%
II. 3. a 4 0 2.0% 100% 0. 000%
II.4.a 2 8 1.0% 20.0% 0. 098%
II. 5.a 6 I0 3.0% 37.5% 0. 122%
II. 6. a 4 5 2.0% 44.4% 0. 061%
II. 7.a 6 9 3.0% 40.0% 0.110%
II. 8. a 14 33 7.1% 29.8% 0. 402%
II. 9.a 13 6 6.6% 68.4% 0. 073%
II.10.a 27 44 13,6% 38.0% 0.536%
II.11.a 34 99 17.2% 25.6% 1.207%
II. 12.a 9 3 4.5% 75.0% 0. 037%
II.13.a 20 54 10.1% 27.0% 0.658%
II. 14.a 26 179 13.1% 12.7% 2.182%
II.15.a 51 325 25.8% 13.6% 3.962%
42
23.6
0
2
3
4
5
4
4
I0
8
18
19
5
II
19
26
y z
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32
32 32