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.
- 210 -
6 8 ii 16 21 31 76 1.01 126 151 176[OCRerr]
-I00 -125 -150 -175 -20G
33
25
17
25
25 25 t
I
8
11 12 I t
I 2O 120
1
25
5O I
t
I
25 25 I t
i 25
15 l
! 20 i
17 17 I i
I
20 I
15
2O
134 174 99 i 127 7O 25 51
Q REL 1 2 3 4 5 -7 -i0 -15 -20 -3.0 -50 -75
79
!l oo! 4 3 33 34
25 25 25
!l[OCRerr]6i 6 16 17 16 17 16
t181 5 2O 20 4O
L19i 6 16 17 17 34
121! 3 33 34 33 I
5 2o t 2O 2O 2O
4 I 2O
25 25
!1261 2 I 50 l,
5O 2aI
25 J I 25 !25 25
32 4 25 25
36 6 17 7 34 34
37 6 i !16 " 16 Ii 17 33
[41 1 1100 "I
L45 12 I 8 9 8 9 8 25 9
L46 9 ll 11 ll 11 11 11
L47 2O 20
L481 5 1
4 25 25 25 201
L671 I 25 E 25 25
iL701 4
2 t ] 25
5O
11811 2 5O 5O
1821 2"5
189l 4i 2 5O 5O
1901 7 14 14 14 i 14
2231 2 i 14
I 5O 5O 15
224 5 i
2O 2O 2O
225 6 16 117 ,I 2o 16 17
226 7 14 14 15 J14 28 15
227 2 5O 50
30 7 14 14 15 !14 14 29
250
'261 8 12 13 12 13 13 112 25
4 25 25 25 25
264 2 5O 5O
266 5 2O 120 2O 20
268 5 2O 2O 2O 2O 2O
269 4 25 25 25 25
272 4 25 25 25 125
273 7 14 14 14 15 14 1 14
274 5 20 2O 2O 20
317 ' 2 5O 5O
323 5 2O 2O 2O 2O 2O
[OCRerr]6oi 8 12 13 12 13 12 13 25
Totals 677 512 260 288 240 198 306 208 174 378 330
FIGURE 5.16T
DOCUMENT OUTPUT CUT-OFF SCORE SHEET AS
FIGURE 5.3T CONVERTED TO AVERAGE OF
RATIOS.