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.
- 277 -
Table of Fallout Ratios for a Generality Nuu[OCRerr]ber of 15.0
R[OCRerr] 5 to
P
0.5 xS*xSa 3o-305
t.o 7.538 z5.o76
a.o 3.73x 7q46a
3.0 [OCRerr]-462 4-9a4
4.o x.827 3-6S5
5.o x.447, [OCRerr].893
7,5 o.939 1.87[OCRerr]
Xo.o 0.685 1.37t
Za-5 0-533 X.o66
t5*o o.43x 0.863
ao.o 0.305 0*609
[OCRerr]$.o 0.228 o.457
30.0 o,t78 o-355
35.0 o.14x o.[OCRerr]83
40.0 0.£74 0.[OCRerr]28
45.0 0.093 0.*86
5o.o 0*076 o.zsa
55.0 o.o62 o.za5
60.0 0*05Z O.g02
65.0 0.04I O*08a
70.0 0*033 o.o65
75,o o.o25 o.o51
8o.o o.o19 0.038
85*0 o*ox3 o-027
9o.o o.oo8 o.o17
95,o 0.004 o.008
YO0*O 0.000 0.000
75
45"457
~2.6I4
17.193
7,386
5.48"~
4.340
a*8X7
2.o56
X®599
X*294
0.9L4
o .685
0-533
o.424
o.343
o.279
o.228
o.x87
o.152
O.Z23
0.098
o *o76
o .o57
0.040
O.O25
O*OI[OCRerr]
o .ooo
2o a5 3°
6o.6o9 75.76! 9o.914
3o-152 37.690 45*028
Z4.924 18-655 aa.386
9.848 ta.3to 14-77[OCRerr]
7,31o 9-137 xo-964
5.787 7*034 8.680
[OCRerr]-756 4-695 5.635
2-74[OCRerr] 3-426 4-112
a.132 a*665 3.198
x.706 a.157 a.589
**,tO t.5a3 X*807
o.9I4 z,142 1.371
0.711 0.888 t.066
0.566 0.707 0.848
0-457 0-57! 0-685
o*370 0-465 0-558
0,305 o.38I o.457
o.049 o.311 0.374
o*a03 0.254 o.3o5
o*x64 o*ao5 o*a46
o. I31 0.X63 o. I96
o.zoa o. I27 o.152
o.o7[OCRerr] 0-095 o.714
o*054 o.o67 o.o81
0.034 o*o42 o.o5I
0.016 0.030 0.024
o.ooe o.ooo o.ooo
35
5a.766
26,117
17~234
IS*792
Z0*127
6-574
4-797
3"73X
3-020
a-x3S
7-599
1-244
o-99°
0-799
o.651
0-533
0.436
0-355
o.a87
o.228
o*178
o-133
0-o94
o-059
0.028
0.000
4O
60.305
29.848
9.695
14*619
11.574
7,513
5.482
4.064
3.452
2.437
t*827
1.42I
1.13t
o,914
0-745
o,6o9
o.498
o.4o6
o*3a8
o,[OCRerr]61
0.[OCRerr]03
0.15[OCRerr]
o,xo7
0.068
0.030
0.000
45
67q843
33.579
22.157
z6*447
t3.0gO
8.452
6.168
4.797
3.883
2,747
a.056
1.599
1-[OCRerr]73
l,Oa8
o.838
o,685
o.561
0-457
o.369
o.294
0.[OCRerr]28
0.171
0*111
o.076
o.o36
0.000
5O
75.381
37.3to
24.619
18.a74
14.467
9,391
6.853
5.330
4-3t5
3*046
2.284
1.777.
1-414
1.142
0.931
0.76I
o.6[OCRerr]3
o.508
o,41o
o,306
o.254
o,I9o
o,I34
o.o85
0.040
0*000
R" 55 60
P
o.5
t.o 80.9x9 90-457
2.o 41.04I 44.77[OCRerr]
3-o 07qo81 09*543
4.o So.los 21-929
5-o 15-914 17[OCRerr]36o
7[OCRerr]5 g°'33° 11"S69
xo.o 7[OCRerr]538 8.023
Is.5 5-863 6-396
XS.O 4.746 5.178
ao.o 3-350 3-655
a5*o a*5[OCRerr]3 a*741
3o.o 1-954 2*73a
35-o z.555 z*697
4o.o z.256 z-371
45*0 I,o24 1,I17
5o.o 0.838 o.9t4
55.o 0.685 o-748
6o.o 0.558 0.609
65-o o*457 o-492
7o.o o.359 o-39a
75.0 o.079 o-3o5
80*0 0.209 0.[OCRerr]28
85.o o.x48 o.167
90.0 0.093 0.I02
95-0 0-044 0-048
XOO*O 0.000 0.000
65 7° 75 8o 85 9° 95
97-995
48.5o3
32.005
23-756
18.8o7
Ia.208
8.909
6.929
5-6o9
3.959
2.97q
2.31o
x.838
x*485
1.210
0.990
0.8Io
0.660
o-533
o.424
o.33o
o.247
o. I75
O*IZO
o.052
o.ooo
52,234
34-467
05*584
ao-254
13.I47
9"594
7.462
6.o4*
4.a64
3-x98
2.487
1.98o
1.599
1*303
1.o66
o*870
0.7[OCRerr]1
o.$74
0-457
o.355
o.066
o,188
0.It8
o.056
0.000
55.964
36.929
aTt4Xz
al*701
14*o86
1o*279
7.995
6*470
4,569
3.426
a.665
20131
1-713
1.396
1.140
o-934
0.767
0.615
O-489
o,381
o,086
0.202
0.127.
0.060
0.000
59.695
39.391
29.239
23-147
15.o25
Io.964
8.528
6.904
4.873
3-655
2.843
a.263
1.827
1.489
1.[OCRerr]18
0-997
0.81a
0.656
o.52[OCRerr]
o.406
0-305
0.215
o.z35
o.064
o.ooo
63*426
41-853
31.o66
24-594
15-964
1t.65o
9.o61
7,335
5-17[OCRerr]
3.883
3coco
a-4o4
Z*94a
1.582
1*a94
z.o59
o.863
o.697.
0.555
0.431
o.324
0*128
0.144
o.o68
0.000
67.I57
44.375
32*893
26.041
x6.9o4
t~.335
9.594
7,766
5.482
4.I12
3.198
2.o56
1-675
1*37Z
t*1[OCRerr]1
o-914
o.738
o.587
o-457
0-343
o,a4a
o*z5a
0.07[OCRerr]
0.000
7o.888
46-777
34.701
07*487
17.843
13.020
I0*I27
8.198
5.787.
4-340
3.376
a.687
2.170
*.768
1-447
*.x84
o.964
o-779
o.6a0
o.482
o.360
o,aS[OCRerr]
o.161
0.076
0.000
ZOO
74.6x9
49-239
36.548
28.934
*8.782
13.7o6
1o.66o
8.629
6.o9g
4-569
3"553
2.8[OCRerr]8
a.a84
t.B6t
1*[OCRerr]23
1.[OCRerr]46
1,o15
0,80o
o.653
o.508
0.381
0.269
o*I69
0.080
0.000