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.
- 217 -
Q REL 1 2 3 4
6 8 ii 16 21 31 51 76 101 126 151 17
5 -7 -10 -15 -20 -30 -50 -75 -i00 -125 -150 -175 -20
79 3
I0O
116 6
118 5
LI9 ___6__ _x__
21 .-__3___ _x_ ' [OCRerr] _z__ __ __
E22 ---[OCRerr]__[OCRerr]_x_ ____2L__
126 2 x
130 [OCRerr] [OCRerr] [OCRerr] _._x__ _
1_32 ___4_. [OCRerr]
136 6 x x x
137 6 x x
[41 1 x
[45 12 x x x
146 9
147 5 x
148 4 x x
167 4 x x
70 2 x
81 2 x
][82 4 x
189 2
190 7 x x x
223 2 x x
224 5
225 6 x
226 7 x x x x
227 2 x x
230 7 x
250 B-_[OCRerr]_ _[OCRerr]_ _[OCRerr]_
261 6 k x x x
.[OCRerr]64 2 x x
5
5 x x x x x
4 x x x x
4 x x
173 7 x x_ x x_ _
74 5 x
I[OCRerr] 2 x
23 5
X
8
'orals
19 1R
X X
--x- __x__ ___x_ -.-x__
[OCRerr]g
--.-X._ _..X.X_
X X X --[OCRerr] [OCRerr]
X X
X X
X X
X X XX X
x x_ xx x
X X
X
X
X l X
x x___ x
X X
X [OCRerr]
X
X
X X
X)f XX
x [OCRerr] ....
X X
X X
X
X
X
-g
x x x x[OCRerr].[OCRerr].._ [OCRerr]_
X X
X X X --[OCRerr][OCRerr]
X X X X
X
X X X X X
x x x _ _/__x x
ifl 9 6 16 19 15 12 13 15 13 7 [OCRerr] [OCRerr]n g
FIGURE 5.22T
DOCI/MENT OUTPUT CUT-OFF SCORE SHEET ON INDEX LANGUAGE I.l.a
FOR 42 QUESTIONS WITH 200 DOCUMENT COLLECTION FOR INDEXING
AT LEVEL OF EXHAUSTIVITY I.