CRANV2
Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2
Appendix 3A
appendix
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.
- 280 -
Table of Fallout Ratios for a Generality Number of 22.5
R[OCRerr] $ xo 15 2o
P
0.5 2=.9o3 45.806 68.708 9z.6zx
z.o zz.394 22.768 34.z8[OCRerr] 45*575
[OCRerr].o 5.639 **.=79 z6*OZ8 22.558
3.o 3-72z 7.442 XZ*X64 Z4.885
4.o =*760 5-524 8°=86 *z,049
5.0 2.187 4-373 6.560 8"747
7.5 x.4*9 2.839 4.258 $*678
Xo.o X.o36 =*o72 3-1o7 4.Z43
X=-5 0.806 *.6zt s.417 3-==3
15.o 0-652 1-3o4 z-957 2-6o9
2o.o 0°460 o.92x z*381 Z-841
25.o o.345 o.691 **o36 t*38X
3o.o o.269 o.537 0.606 *.074
35.o o*=I4 o-4[OCRerr]7 0.64* 0.855
40.0 o*I73 0.345 o-5*8 o-69*
45.0 o.z4z o.28z 0.4== o.563
$o.o o.z*5 o.=3o 0.345 0-460
55.o 0.094 o.z88 0.=82 o.377
6o.o o.o77, o.153 0-230 0.307
65.0 0.062 o.z=4 o.,86 o.248
7q.o o*o49 o-o99 o*z48 o.197
75.o 0.038 o*o77 o.*t5 o..53
8o.o 0.0=9 0-058 0.086 o,**5
85.o o.o=o 0.04= o.o6x o.o8z
9o.o o.ox3 0.0=6 0.038 o.o51
95.0 0.006 o.oz= 0.0*8 o.o=4
XOO*O 0*000 0*000 0*000 O*OO0
25
56-969
28*197
Z8.606
z3*8zZ
*o.934
7-o97
5**79
4.o28
3*261
=.302
I*726
*-343
1.069
o.863
o,7a3
o.575
o.47t
o.384
0*3Z0
o,247
0.192
o*z44
0.Z02
0.064
o.030
0°000
3°
68.363
33-836
22.327
*6-573
I3.120
8.5*7
6-215
4-834
3-9x3
2-762
=*072
X*6XX
1.283
ZOO36
0.844
o.69*
0-565
0.460
o-372
o*296
0.230
0oZ73
O°g==
o*o77
o.o36
0.000
35
79-757
39-476
=6.049
*9-335
x5.3o7
9-936
7°=5z
5-639
4°565
3-==3
2.417
Z.88o
I.496
1.2o8
0.985
0.806
0-659
0.537
0-434
0.345
o.269
0.201
0.I42
0.090
0*042
0.000
4°
9I.XSI
45-X15
29-77~
2~*o97
17°494
z* .355
8.286
6.445
5.217
3.683
2*762
3.148
I.TiO
*.38I
X*I25
0.921
0-753
0.6Z4
0-496
0.395
0.307
0*230
0.162
0.102
0.048
0*000
45
50.754
33-49z
=4.859
X9.68o
I2-775
9-3s=
7,25I
5.870
4ol43
3-I07
2.417
Z09=4
*.554
x.266
Z.o36
0.847
0*69%
0.558
0-444
o*345
o*259
o.z83
o*l*5
0.055
0.000
5°
56*394
37*2z2
27o621
21.867
z4-194
1o.358
8.056
6.5==
4.6o4
3-453
=.685
2-*37
I.726
1.4o7
X**5X
0.942
o.767
0.620
o*493
0-384
0.288
0,=03
0.Z28
0.06I
O.OO0
R[OCRerr] 55 60 65 7o 75 80 85
P
o-5
Z.O
=.o 62*033 67.673 73-3*2 78.95z 84.59* 90-23° 95"870
3-o 40-934 44.655 48.376 52-o97 55.818 59-54° 63.26z
4*0 30.384 33.146 35.908 38-67Q 4x-432 44"x94 46"957
[OCRerr]*0 24.o54 =6.24o 28.427 3o-614 32.80I 34*987 37*174
7q5 15*6X4 17*°33 *8"453 I9"872 2I'292 32"711 24"I3°
X0.0 xz.394 z=.43o x3.465 z4.5ox z5-537 16-573 17.6o9
I=-5 8.862 9-668 1o.473 I1*279 12.084 12-89o 13*696
ZS*o 7*X74 7.826 8.478 9-13° 9-783 Xo.435 11-o87
SOoO 5*064 5-524 5-985 6-445 6*905 7*366 7.826
=5.o 3-798 4-143 4.468 4.834 5.179 5-524 5-870
3o*o =.954 3.2[OCRerr]3 3.49z 3*76o 4*028 4-297 4.565
35-o 2*351 2*565 2-779 2-992 3-206 3*420 3*634
4o*o 1-899 2-o72 =*[OCRerr]44 =.417 2.59o 2-762 2.935
45.0 1.547 1.688 1.829 1.969 =.11o =-=5z 2-391
[OCRerr]o.o 1.266 1.38z [OCRerr].496 X.6lI 1.726 1*841 1"957
55.o z.o36 ,.13o ,.224 z.2z8 **4,2 z.5o7 x.6oz
6o.o 0.844 0.gaI 0*997 I.o74 Z.ISI Z*228 1*304
65.o o,68[OCRerr] o,744 o,6o6 o.866 0.93o o*992 l'°54
70*o 0.543 0.59= o,64! 0*69z 0.740 o-789 0,639
75.o O.4aa o.46o o.499 o.537 o.575 o.614 0.65=
8o.o o.316 0.345 o.374 o.4o3 o*432 o*46o o*489
85.o 0.2=3 o.244 o.264 o.=84 o,3o5 0"325 °'345
90.0 o. I4I o.,53 o.166 o.z79 o.I92 o-=o5 o*2z7
95.o o.067 0.073 0.079 0.085 o,o9z o*o97 o-lo3
Xoo.o o.ooo o.ooo o.ooo o.ooo o.ooo 0.ooo o.ooo
9°
66.982
49.7t9
39-36'
=5.550
I8.645
14,5Ol
11-739
8.[OCRerr]86
6.[OCRerr]Z5
4-834
3-847
3.Io7
2-532
2.07[OCRerr]
z*695
1.38*
I***5
0.868
0.69I
o.5*8
0.366
0.230
O.IO9
0.000
95
70.7o3
50*48*
4Z.547
=6.969
19.68o
15.3o7
12.39z
8*747
6.560
5.102
4.06I
3.280
2*673
=*Z87
1.789
*.458
1-177
0.937
0.729
0.547
o.386
o.243
0.115
0*000
74*425
~5"=43
43.734
28.389
=o*7x6
*6.IX3
*3.o43
9-2o7
6*9o5
5"37*
4-=75
3"453
=.813
=.3o2
Z.863
1*535
x-=39
o.986
0.767
o.575
0.406
o,256
O*X=I
0*000