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.
20 -
Co -ordination
Search Rules
Precision
Device
Document
Relevance
Recall Exhaus-
Device tivity
!.l 1
2
3
1.2 1
2
3
1.3 1
2
3
1.5 1
2
3
1.6 1
2
3
a
b c I d
1 1-2 1-3 1 - 4
R P R P RP!RP R P R P1 R P R P
Ii 29 4 43 . 71i 2 71 I
11 13 4 19 3 381 3 50
38
ii 13 4 19 3 3 50 3 I00 3 i00 2 100 2 I00
11 29 4 43 2 71 2 71
4 19
4 19
4 43
4 19
4 19
4 38
4'14
5 14
4 38
6 20
8 19
3 38 3 50
3 38 3 50 3 100
2 71 2 71
3 38 3 5O
3 38 3 50
3 75 2 75
3 32 4 45
4 28 4 38
3 75 2 75
4 36 4 48
5 31 5 41
3 i00
3 I00 3 I00
5 i00 3 I00
o 5/j
2 i00 2 i00
2 100 2 100
2100100
2_ i00 2 I00]
ll [
Ii [
11 2
ii I
II 1
Ii 2
Ii
11 7
Ii
17 1
17
FIGURE 2.10d. THE COMPOSITE TABLE. COORDINATION LEVEL 7+