CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Methods for presentation of 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.
Coordination
Level
Minus 11
Minus 10
Minus 9
Minus 8
Minus 7
Minus 6
Minus 5
Minus 4
Minus 3
Minus 2
Minus i
Maximum
I00
9O
8O
7O
60
_1
--I
<
t.) 50
[OCRerr] 4o
3O
2O
I0
"0
FIGURE 3.29TP
IO
-67 -
Recal]
Ratl o
94.5%
94. 2%
93.2%
91. 2%
86.3%
78. 8%
67.7%
54.2%
38.7%
25.3%
ii. 0%
Precision
Ratio
O. 9%
z. 0%
1.2%
1.4%
z. 8%
2.4%
3.9%
6.8%
8. 7%
9.3%
14. 4%
47.6"/0
20 30 40 50 60 70 80 90 I00
°/o PP, ECISION
TABLE AND PLOT FOR RESULTS BY METHOD 3, MAXIMUM
STARTING TERM COORDINATION LEVELS, FOR INDEX
LANGUAGE I. 1. a.
(INDEX LANGUAGE i 6. a. DOTTED LINE)