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.
- 286 -
Table of Fallout Ratios for a Generality Number of 45.0
R" 5 1o z5 3o
P
o.S 46.885 93.770
1,o 23.335 46.649 69-974 93.298
3.0 11,545 33°089 34.634 46o178
3,o 7,618 15,336 32.853 3o.471
4. o 5.654 it.3o9 16.963 22.618
5,o 4+476 8-953 13-429 17,9o6
7-5 2"906 5°813 8°7*7 it.623
1o.o 2.12o 4+2 4i 6.36[OCRerr] 8. 482
12+ 5 1"649 3"298 4°948 6. $97
15.0 1-335 2-670 4-005 5-34°
[OCRerr]o.o 0.942 1.885 2.827 3-770
25.o 0.707 I. 4z 4 2.12o 3.817
3o.o o. 55° i.o99 1.649 2.i99
35. o o. 438 0.875 1.3*3 *.75o
4o.o o, 353 0.707 1.o6o i. 414
45.o 0.288 0.576 0.864 t.152
5o.o o.236 o° 47t 0+707 o.94[OCRerr]
55.0 o.t93 0,386 o.578 o.771
60.0 o+ 157 °"314 Oo 47t 0.628
65.o o. t27 o.[OCRerr]54 o°38t 0-507
7o.o o. to.. o.2o= 0.303 o. 4° 4
75.o 0.079 o. t 57 o.236 o. 3l* 4
8o.o 0.059 o.118 o.177 0.236
85,o o,042 o.o83 o.125 o.t66
9o,o 0.026 0.052 0+079 o-l.o5
95.0 o.o12 0.025 0.037 0.050
I. oo, o o, ooo o.ooo o.ooo o°ooo
25
57.723
38.089
28.272
2.2 °38=
I 4+529
10.6o2
8.a 46
6.675
4+71a
3,534
2.749
2.188
1.767
I. 44°
1,178
o.964
0.785
0.634
o.5o5
0.393
0.295
0+208
O.13ii
00063
o.ooo
3°
69.267
45-707
33.927
26.859
17. 435
l.~-733
9.895
8.ol.o
5.654
4.2 4i
3.298
3.625
t.728
1.4t4
[OCRerr].* 157
o.94=
o. 76[OCRerr]
0.606
oe 47ii
0.353
o. 49
o.157
0.074
0.000
35
8Oo813
53,325
39.581
3l'-335
ao.34o
t 4.843
11.545
9.346
6e597
4.948
3.848
3,o63
2. 474
2.ol.6
1.649
1,3 t9
i .o99
0.888
o. 707
0*550
Oe 412
0.291
o.183
0.087
o.ooo
4o
9=.356
6o.942
45.336
35.81=
23,246
16o963
13.194
lo.681
7,539
5.654
4.398
3.500
2°827
2.3o4
1.885
1.54J
1.257
[OCRerr]..ol.5
0.808
0.628
o. 47t
0.333
0°209
0*099
0°000
45
68.560
50.890
4o.=88
26.l.53
19.o84
* 4.8 43
12.016
8, 482
6.361
4.948
3.938
3,18s.
3.592
2.i20
t-735
1.414
0*909
0.707
0.530
0.374
0.236
0[OCRerr]113
5°
76.l.78
56.545
44-764
39.058
31.204
* 6. 492
13-351
9.4[OCRerr]4
7.068
5. 497
4-375
3-534
2°880
2.356
i.938
1.571
t.[OCRerr]69
I*010
0.785
o*589
o, 416
0.262
0.l.34
OeO00
R'+ 55 60 65 7o 75 80 85 9° 95 l.oo
P
0,,,5
leo
31o
3,o 83.796 91e414 99.o3z
4, o 62.199 67.853 73.5°8 79*162 84"817 9°" 47l' 96" l'26
5.0 49-S 4i 53®7*7 58*1[OCRerr]4 62"670 67et 47 71"623 76"099 80"576 85"053 89"539
7*5 31*963 34"869 37.775 4oo681 43"586 46"492 49"398 52°3°4 55"209 58"1i5
*o.o 23.325 35.445 27-565 S9o686 31,806 33.937 36.047 38.z68 4°.288 4s'4°8
12.5 18.,41 19.791 21.44° [OCRerr]3.o89 2 4.738 26.387 28.037 29.686 31.335 $2-984
I.[OCRerr].0 14.686 16.os* t7.356 t8.691 20.o26 21.361 23.696 34.031 35*366 2 6"7°2
aoeo *o* 366 1t*3o9 t3.351 X3*i94 14-t36 t5"°79 16.o21 t6.963 i7.906 i8*8 48
=5-o 7-775 8°483 9-188 9.895 *o.6o2 11.3o9 13.o16 La.733 t3.4[OCRerr]9 i4-i36
30.0 6*o47 6.597 7-147 7.696 8.246 8.796 9.346 9*895 to-445 1o-995
SS.0 4.813 5+251 5.688 6.126 6.563 7.00i 7.438 7.876 8.313 8.755
4o-0 3.887 4*24i 4.594 4"948 5.3ol' $.654 6.oo8 6.361 6.715 7-068
45-o 3-168 3*455 3-743 4"°3i 4-319 4.607 4"895 [OCRerr]"l.83 5" 47l' 5-759
50. o 2.593 [OCRerr].827 3.063 3*398 3.534 3°770 4-005 4.2 4i 4- 476 4.7t2
55. o =.tao =.313 s-5o6 3.699 2.891 3.084 3-277 3. 47° 3.663 3+855
60.0 t.728 i.885 2.o4a 3.199 2*356 3"5t3 2"670 s'827 2"984 3"1 41
65-0 l'. 39[OCRerr] 1-523 *-649 1.776 1.9o3 2.030 2.157 2.384 2. 410 2-537
70. o [OCRerr]..111 1.212 1.3[OCRerr]3 1.414 1.515 1.61.6 1.717 1.818 i.918 2.019
75.o 01864 0.943 1.o21 1oO99 1.i78 1.257 1.335 1. 414 l.. 492 1.57l'
80.0 0.648 0.707 0.766 0.825 0.884 °"942 1.ool. l..o6o l..119 i.i78
85.o o+ 457 o. 499 °-54° o.582 o.6[OCRerr] 4 0"665 0.707 o.748 0.79° 0"832
9o.o 0.2.88 o.314 0.340 0"366 0.393 o. 41.9 o. 445 o. 471 o, 497 o-52 4
95.0 o°136 o.i49 o.161 o-174 Oo186 O. t98 " o.2 t I. o+s=3 0-336 °+348
100.0 0.000 0.000 0.000 0.000 0+000 0.000 0.000 0.000 0.000 0.000