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.
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Table of Fallout Ratios for a Generality Number of 27.5
R" 5 to. * 5 so = 5 30 35 4° 45 50
P
0.$ a8.136 56.272 84.4o9
I.o 13.997 270995 4to99a 55.99° 69*987 83-985 97.982
[OCRerr].o 6.928 13.856 =o,784 27.7t2 34.640 41.568 48.496 55.4[OCRerr]4 62.35[OCRerr] 69.280
3.o 4*$72 9*143 13*7[OCRerr]5 18e186 aa.858 27.4[OCRerr]39 32.ool 36,57[OCRerr] 4x*144 45,716
4*° 3-393 6.787 lo. t8o '3-573 *6-967 2o.360 =3-753 27.:47 30.54° 33-933
$.o 2.686 5*373 8.o59 to.746 t3.432 16, x18 18.8o[OCRerr] 21.49[OCRerr] 24,:77 06.864
7-$ X-744 3*488 5-231 6.975 8.7*9 io. 463 1=o2O7 t3.95o 15.694 17.438
to.o t.[OCRerr]72 a.545 3.8t7 5.090 6.362 7.635 8.907 1o.[OCRerr]8o z:. 452 Ia.725
12.$ 0.99o t-979 2-969 3.959 4.949 5"938 6"928 7-918 8.9o7 9.897 -
tSaO Oe801 t.602 2. 404 3.205 4.006 4. 807 5.608 6. 410 7.21, 8.012
SOeO 0.$66 *.131 *.697 2.=62 2.828 3-393 3-959 4"5= 4 5-09° 5©656
25,,o oe424 o.848 *,[OCRerr]272 t.697 a.t2t =.545 2-969 3-393 3-817 4.24a
30. o 0.330 0.660 0.990 t.3so t,65o 1.979 2.309 2.639 a.969 3.299
3..;.O 0.263 0.525 0.788 t.050 1.313 1.575 1.838 2.1oi 2.363 2.626
4o. 0 O.=ta oe 42 4 °'636 o.8 48 I.o6o 1.272 i. 485 *.697 *.9o9 a.*= x
45eo 0*.73 0*346 o.5t8 o*691 0.864 *.o37 l.[OCRerr]xo t.38[OCRerr] 1.555 1.728
5o.o o. t 4* o.283 o. 4= 4 o.566 o.7o7 o. 848 o.99° *. 131 t.[OCRerr] 72 I. 4' 4
[OCRerr]5.o oett6 o.33t 0-347 o-463 o.578 0.694 o.[OCRerr]1o o.925 *-o4* 1.157
6o.o 0.094 o..I.89 o.283 o*377 o*471 0.566 0,660 o-754 0-848 0.943
65.o o.o76 o.t$2 o.sa8 0.305 o.38* o. 4[OCRerr]7 o-533 o*6o9 0-685 0-76*
7oeo o.o61 oct21 o.,8[OCRerr] oeg 4= 0.3o3 0.364 o. 42 4 oo 485 0-545 o.6o6
75.0 0.047 0.094 O.t41 0.189 0.236 0.[OCRerr]83 0.330 0.377 0.434 0.471
8o,o 0.035 o.o7,, o.to6 o,[OCRerr] 41 0°*77 0.2,2 o.2 47 o,283 o-318 0-353
85.o 0.0"5 o.05o 0.075 o.10o o. Ia5 o.15o o.175 0.200 o,225 0.250
90. o 0,0*6 o.o31 0.047 o*o63 o,o79 0.094 o.11o o.126 o.141 o.157
95,0 0.007 OeOt5 0.022 0.030 0.037 0.045 o.o5[OCRerr] 0.060 o.o67 o.o7 4
OOeO 0.000 0.000 0,000 OeO00 OeO00 0.000 0.000 0=000 0,000 0,000
R'* 55 6o 65 70 75 80 85 9° 95 too
P
0.5
*eo
2.o 76.2o8 83.136 90.064 96.992
3.0 50.21[OCRerr]7 54-859 59.43o 64. oos 68.573 73-t45 77"7*6 82.=88 86.8[OCRerr]9 9ie43i
4.0 37.336 4o. 7[OCRerr]o 44. z[OCRerr]3 47.5o6 50.90o 54.293 $7.686 61.080 64.473 67*866
5.0 29.55o 32.237 34-913 37-609 4o.196 4=.982 4[OCRerr].668 48-355 .5t-0 41 $3*728
7-5 £9"* 83 [OCRerr]o.925 - [OCRerr]2.669 24.413 [OCRerr]6. i57 [OCRerr]7-9ol 29"644 3*'388 33" 132 34"876
iO.O 13.997 15-37o 16.542 *7.215 19"087 20"36° 2*'632 =2"9°5 [OCRerr] 4"177 25"450
!2.$ i0.887 21-877 Is&866 13.856 [OCRerr]4.846 *5-835 i6.825 i7"815 18"805 19"794
15.0 8.813 9.6i4 Io. 416 11.217 i2.o18 1z,819 13.6[OCRerr]o 14°422 *5"[OCRerr]=3 16"°2 4
2o.o 6.221 6.787 7.352 7.918 8.483 9.049 9.614 1o.18o *o.746 It.311
[OCRerr]5.0 4.666 5.o9o 5. _[OCRerr]14 5"938 6"362 6"787 7"2ii 7"635 8"059 8. 483
30.0 3*629 3"959 4"289 4"619 4-949 5,278 5"6°8 5-938 6.268 6.598
35" 0 2. 888 3- 151 3. 414 3. 676 3. 939 4"[OCRerr]°1 4" 464 4" 7=6 4" 989 5 "[OCRerr] $2
40.0 2-333 2.545 -[OCRerr]. 757 =.969 3"181 3-393 3"605 3"817 4"030 4"24[OCRerr]
45.0 1.901 S.074 2,2 47 2. 419 2.592 2.765 z.938 3.[OCRerr]t[OCRerr] 3.283 3, 456
$o.o *.555 1"697 1"838 1"979 2.*21 2.2.62 2.4o4 2.545 s.686 =.828
$$.o I.z72 1.388 1.504 1.620 X-735 1.851 x.967 =.o82 [OCRerr].198 s-3i4
60.0 *.o37 *.*3* [OCRerr].=25 x'32° x. 414 1"5°8 i.6os 1.697 1.791 1-885
65.0 0.837 o.914 0.990 :.o66 1,14[OCRerr] *.218 i.294 *.37o 1-447 i'523
7o.o 0.667 0.727 o.788 0.848 o.9o9 0.97° 1.o30 1.091 1"151 1,212
75.0 o.5i8 o.$66 0.613 0.660 o.707 0.754 o.8ox o.848 0.895 °-943
80. o O. 389 O. 4a 4 o. 460 o. 495 0.530 o. 566 o.6oi 0.636 O. 672 o.907
85.0 o.274 °-299 0-324 0.349 0-374 0.399 o.424 0.449 o.474 o.499
90.0 0*173 0.189 0.[OCRerr]04 Oea20 0e236 o,251 0.267 0.283 o.298 0*3i 4
95.0 0.082 " 0.089 0.097 0.i04 Oeli[OCRerr] 0.119 o.t27 0.134 0-141 0"149
[OCRerr].OOe O 0,000 0.000 O*OOO 0,000 OeOOO 0.000 0.000 0.000 0,000 0,000