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.
- 283 -
Fable of Fallout Ratios for a Generality" Number of 30.0
[[OCRerr] 5 io *5 2o [OCRerr]5 3° 35 4° 45 5°
P
o. 5 30.773 6,.546 9[OCRerr].32o
i.o 15.3o9 3o.6i9 45.928 61.237 76..546 91.[OCRerr]56
=.o 7-577 '5"'55 22o73[OCRerr] 3o-3o9 37.887 45.464 53.o4t 6o.6i9 68.196 75-773
3.0 5.000 to.ooo 15.ooo 20.000 25.000 30.000 35.000 40.000 45.000 5o.ooo
4. o 3.7,1 7.423 11.134 14.545 18.557 22.268 25.979 29.69i 33.402 37.1i3
5.0 a.938 5-876 8-814 11.753 t4.691 17.629 20.567 23.505 26.443 29.382
7.5 *.9°7 3.8'4 5.7z2 7.629 9.536 II-443 i3.351 15.258 17.,65 19.o72
1o.o 1.392 2.784 4.175 5.567 6.959 8.351 9.74[OCRerr] 11.134 12.526 13.918
ga.5 1.o8z 2.,65 3.247 4.330 5.412 6.495 7-577 8.660 9.7[OCRerr] 1o.825
Z5-0 0-876 *-753 2.629 3.505 4.381 5.258 6.134 7.olo 7.887 8.763
=0.o o.619 1.237 1.856 =.474 3.093 3.711 4.33o 4[OCRerr]948 5.567 6.186
25"° 0"464 0"928 1-392 1-856 2-32o 2-784 3o[OCRerr]47 3.711 4-175 4.639
30.0 0.36£ 0.7=2 1.o82 1.443 1.8o4 2.165 2.526 S.887 3.247 3.608
35.0 o.=87 o.574 o.862 1.149 1.436 Io7Z3 2.olo 2.297 a.585 2.872
4o.o o.23[OCRerr] 0.464 0.696 0.928 i.iTo 1.392 1.624 1.856 2.088 2.32o
45-° o-i89 0-378 o.567 0.756 0-945 i.134 i.323 1.512 1.7oi 1.89o
[OCRerr]o.o o. t55 0.309 o&464 o.619 o.773 0.9=8 I.o8= 1.237 1.392 i.546
[OCRerr]$.o o. i27 o.=53 o.38o o.5o6 0.633 0.759 0.886 I.O1[OCRerr] 1.139 1.265
60.0 o. t03 o.so6 0.309 o.412 o.515 o.619 0.722 0.825 0.928 1.o31
6[OCRerr].o 0.083 o.167 0.250 0.333 o.416 0.500 0-583 0.666 o.749 0.833
70.0 0.066 o.133 o-199 0.=65 0.33t 0.398 0.464 0.530 0.596 0.663
75.0 0.05= OolO3 o.155 0.206 o.z58 0.309 o.361 o.4i2 0.464 o.515
80.0 0-039 0.077 o.116 o.i55 o-i93 o.[OCRerr]32 o.27t 0.309 0.348 0.387
85.0 o.o27 0.055 0.082 o.1o9 o.136 o.164 o.191 o.218 o.246 0.273
90.0 o.o17 0.034 0.052 0.069 0.086 o. to3 o.12o o.137 o.155 o.172
95.0 0.008 o.o[OCRerr]6 0.024 0.033 o.o4* 0.049 0.057 0.065 0.073 o.o81
00.0 OsO00 0.000 0.000 0.000 0.000 O. O00 0.000 0.000 O.O00 0.000
55 60 65 70 75 80 85
P
0.5
leo
a.o 83.351 90.9=8 98.505
3.0 55.000 60.000 65.ooo 70.000 75.000 80.000 85.000
4'o 40.8=5 44.536 48.[OCRerr] 47 5t.959 55.670 59.381 63.093
5oO 32.320 35.258 38.196 41.t34 44.o72 47.olo 49.948
7.5 =o.979 ==.887 =4.794 26.7oi =8.6o8 3o.515 32. 423
io.o 15. 309 16-7o* 18.o93 19. 485 =0.876 22.268 23.66o
is.[OCRerr] ii.9o7 is.99o t 4.o72 15.155 16.237 17.32o 18.4oa
15.o 9.639 [OCRerr]o.515 .I.392 12.268 13.144 [OCRerr] 4oO=1 14.897
20.0 6.804 7.423 8.o41 8.66o 9.=78 9.897 toe=t=
25.o 5.1o3 5.567 6.o31 6. 495 6"959 7. 423 7.887
30-0 3*969 4-330 4-691 5.052 5-4i2 5-773 6.1'34
35.o 3-159 3.446 3.733 4.02* 4.308 4. S95 4-88=
4°.0 a"552 a.784 3-o15 3-2 47 3- 479 3.7[OCRerr]i 3,943
45.0 =.o79 =.268 =. 457 2.646 =.835 3.oa4 3.=z3
[OCRerr]OeO i.70i 1.856 =.010 a.165 Z.320 =-474 a-629
fiS.[OCRerr]*o 1.39= *.518 I-.645 1.771 1.898 2,,024 =,tSl
o.o l.z 3 4 1.237 [OCRerr] 3 4° 1. 443 1.5 46 i.649 1.7[OCRerr]3
65.0 o.916 o.999 [OCRerr].o8a 1. 166 l.g 49 S.332 I. 416
70.0 0.729 0.795 0.86[OCRerr] 0.928 0.994 I°o60 i.tS7
75.0 0"567 °'6i9 0-670 o.722 0.773 0.8=5 0.876
8o,o o. 4[OCRerr] 5 o. 464 o. 503 o.5 4s o. 580 o. 6z9 o.657
85.o o.3oo o.327 o. 355 o. 382 o. 409 o. 437 o. 464
90.0 o. 189 o.[OCRerr]o6 o.223 o.2 4t Oo2[OCRerr]8 0.275 o*a9a
9[OCRerr].. o o. 090 o. 098 o. i 06 o. 11 4 0.122 O. ! 30 O* g 38
00.0 O° 000 O.O00 O. 000 0 .O00 0.000 0.000 0.000
9°
90.00o
66.8o4
52.287
34-330
25.052
19. 485
15.773
il.134
8.351
6. 495
5.169
4-~75
3.4o=
=,784
=.a77
s.856
z. 499
i.i93
o.928
0°696
O* 491
o*3o9
o.t 47
o.ooo
95
95.000
70-515
55-825
36.237
26.443
=o.567
16.649
11'753
8.814
6.856
5.457
4-4o7
3-$9'
=,938
"=.4o4
i-959
*.58=
i.259
o.979
0-735
o.518
o.326
o.s55
0.000
1oo.ooo
74.227
58.763
38.[OCRerr]44
=7.835
21.649
17.5a6
i2.37i
9,a78
7.a[OCRerr]6
5.744
4-639
3.780
3,o93
=.53o
[OCRerr].062
1.665
i.3a$
[OCRerr].o31
o,773
o.546
o.344
o.163
0.000