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.
- 196 -
Q ] REL 6 8 11 16 21 31 51 76 lOl 126 151 176
I -50 -75 -i00 -125 -150 -175 -200
I X
X L
X X x i
I I I
XX
X 1
I
t X
X Xt . i
I I I
XXXX X I
X X x
Ix xl
I X
X I i
X I
b I
X x I x i
X t I I
X X t
1 l
t I
X X X I
X x I x t
XX X I
I I
XX I !
X X {
I
I I
I
X X
X
i7 8 7 5 6 3 1
76 2 3 4 5 -7 -10 -15 -20 -30
79 3
85 89 92 95 98 99
12 8 6 4 4 3 3 i:oo X X
O0 4 X x X
16 6 X X X
5 X X X XX
19 6 X X X X
?1 3 X X X
5 X X X X
23 4 X X X
26 2 X X
3O 4 X X X x
32 4 X
[36 6 X X X X XX
1371 6 X X XX XXl
1411
145I 1 X
X X X X
146! 12 X X X
9 X X X X X X
147 5 X X
148 4 X X X X
167 4 X X X
.7O 2 X
181 2 X X
182 4 X
189[OCRerr] 2 X
190! 7 X X X X X
223[OCRerr] 2 X X
224 5 X )f
225] 6 X X X
2261 7 X X X x
2271 2 X X
230 7 X X X X X
250 8 X X X X X X KX
261[OCRerr] 4 X X X X
264 2 X X
266 5 X X X
268 5 X- X X X X
269 4 X X X X
272 4 X X X X
273 7 X X X X X 'X X
274 5 X X X
317 2 X x
323 5 X X X X
360 8 X X X X. X X XX
Totals 23 21 13 13 12 11 16 14 10 18
R e call 12 22 29 35 41 47 56 62 67
Precision 55 51 45 42 39 32 26 2O 16
FIGURE 5.3T
DOCUMENT OUTPUT CUT-OFF SCORE SHEET FOR
INDEX LANGUAGE I.l.a FOR 42 QUESTIONS WITH
200 DOCUMENT COLLECTION.