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 5.0
R+ 5 Io 15 2o 25 30 35 4o 45 50
P
0°5 5.000 to.o,, 15.ooo 20.00o 25.000 30.000 35.000 40. o00 45.000 50.000
1.o 2.4[OCRerr]7 4-975 7°462 9.95° 12. 437 14"9[OCRerr]5 '7°412 19"899 22"387 24"874
z.o 1.231 2. 462 3.693 4°925 6.156 7.387 8.618 9.849 ,IOO8O la.5la
3- o o. 812 I. 62 5 2. 437 3.25° 4,062 4.87 4 5. 687 6. 499 7. 312 8.12 4
4. o o.6o3 1.2o6 1.8o9 2. 4*2 3.0*5 3.618 4-221 4.824 5-4[OCRerr]7 6-°3°
5.0 o. 477 0.955 1. 432 I.91o 2.387 2-864 3.342 3-819 4.296 4.77 4
7.5 o. 31o o. 620 0.930 1.2 4° 1-5 49 I. 859 2.169 2. 479 2. 789 3.099
1o.o 0.226 0.452 o°678 0.905 1.131 1.357 1.583 1.8o9 2.o35 2.261
12o5 o.176 0.352 0.528 0°704 0.879 I.o55 *.231 I°4o7 I.583 I°759
15.o o.142 0.285 o.427 0.570 o.712 0.854 0°997 1.139 Io281 i°4z4
20.0 o.1oi o.2oi 0.302 o. 402 0.503 0-603 o°7o4 0.804 0-905 I°°°5
25. o 0.075 o.151 o°226 0.302 0.377 o. 45[OCRerr] o.528 0.603 0.678 0.754
30.0 0.059 o. 117 o-176 0.235 0.293 o. 35e o° 41o o. 469 o°528 0.586
35.o o. o47 0.093 o.14° o.lS7 0-233 o.[OCRerr]SO 0.327 0-373 0o42O 0.467
40.0 0.038 0.075 0.113 o. 151 0.188 o.226 o.264 o.3o2 0.339 0°377
45.o o.o31 o°o61 o.o92 o.123 o°1[OCRerr]4 °.184 0.215 0"246 °'276 °'3°7
50.0 0.025 0.050 0.075 o.1oi o.126 o.151 o°176 o.2oI 0.226 o.[OCRerr]51
55.0 o°o21 o.o41 0.062 o.o82 0.Io3 o. 123 0-144 o-164 0.185 0°206
60. o o. 017 0-034 0"050 0°067 O. oG 4 o° 1 oI o. 117 o. 13 4 o. 1 51 o. 1 68
65.0 o.oi4 0.027 o.o41 0.054 o.o68 o. o81 0.095 o.1o8 o.122 0.i[OCRerr]5
70.0 O.011 0.o22 o.o32 o.o 43 0-05 4 0"065 0"075 o.o86 0.097 o° 1o8
75.0 0.008 o.o17 0.025 0-03 4 o.o 4[OCRerr] o°o5o 0.059 0.067 0.075 0.08 4
80.0 0.006 o.o13 0.o19 0-025 0°o31 0"038 0"044 °'°5° 0"057 0"063
85°0 o.oo 4 °.°°9 °"°13 o.o18 0,022 0.027 o.o31 0.035 o.o 40 o.o 44
90.0 0.003 0.006 0.008 0.011 0°01 4 0.017 0.020 0.022 0.035 0.028
95" 0 O. 001 0.003 0.00 4 0"005 0"007 O. 008 0.009 0.011 o.012 o. o13
£ 00. 0 O. 000 0. 000 O. 000 0. 000 0,000 O, 000 O. O00 0,000 O. 000 0 ° 000
Jq+ 55 60 65 7° 75 80 85 9° 95 *oo
0.5 55.00o 60.000 65.000 7o.ooo 75.000 80.000 85.000 90.000 95.000 too.o,,
1. o 27.36-" 29.849 32°337 34-824 37-312 39-799 42,[OCRerr]86 44.774 47-26[OCRerr] 49-749
2.o 13.543 14.774 16. oo5 17.236 18.46? 19.698 20.930 22.161 [OCRerr]3°39s 24.623
3.o 8,936 9-749 1o,561 1:L-374 12.186 12.998 13.811 14.623 15-436 16-248
4.0 6.633 7.236 7-839 8-442 9-045 9.648 1o.251 1o.854 11.457 12.o6o
5°o 5.251 5.729 6.206 6.683 7.161 7°638 8.116 8.593 9.070 9-548
7- 5 3. 409 3- 719 4.02 8 4. 338 4- 648 4" 958 5.2 68 5" 578 5" 888 6. 198
1o.o 2. 487 2.71 4 2°9 4° 3- 166 3.392 3. 618 3- S 44 4-07° 4.296 4. 523
12.5 1.935 2°111 [OCRerr].286 2. 462 2.638 2.[OCRerr]14 2.990 3*166 3"34[OCRerr] 3"518
15" 0 I. 566 I. 709 1.851 I. 993 S. 136 2.278 2. 42O 2. 563 2. 705 2.8 48
SO.O I. 106 1.206 I. 307 I. 4o7 1.508 1.608 I.7o9 I.8o9 1.910 2.01o
25.0 0.829 0.905 0.980 1.o55 1.131 I°=o6 1.281 1.357 I. 432 1.508
30.0 0.645 0.7o4 0.76[OCRerr] 0.821 0.879 0.938 0.997 1.055 1-114 £'173
35- o o+ 513 o. 560 o. 607 o. 653 o. 700 o. 7 47 o. 793 o. 8 4° o. 887 0 o 933
4o. o o. 41 5 o. 452 o. 49° o. 528 o. 565 O. 603 0.6 41 o. 678 o. 716 o. 75 4
45.0 0.338 o.369 o.399 o.43o o. 461 o. 491 o.522 0.553 0-583 0.614
50.0 0.276 o.3o2 0.3[OCRerr]7 0.352 o.377 o. 4o2 o.427 o. 452 o.477 Oo5O3
55°0 o. 226 0+2 47 O. 267 O. 288 O. 308 O. 329 o. 3 49 O. 37° O. 391 O. 411
6o,o o. 18 4 o.2ol o.218 0.235 o-251 0.268 o,285 0.302 o. 318 0+335
65.0 o, 149 o.162 o.176 o,189 0.203 o,216 0.230 0.244 0.257 o.271
7o.0 Oo 118 O. t29 o. I 4° O. 151 O, 162 O. 172 O. 183 o. 194 0.205 o.215
75. o o. 092 o. 1oi o. 1o9 o. 117 o. 12 6 o. 13 4 o. 1 42 o. 151 o° 159 o. 1 68
80.0 o. o69 0.075 o.o8[OCRerr] 0.088 0.094 o. 1oi o.1o7 o.113 o.119 o.126
85.0 o. o49 0.053 0.058 0.062 0.067 o. o71 0.075 o.o8o o°o84 0-089
9o.o o. o31 0.034 0.036 0.039 o.o4[OCRerr] 0.045 0.047 0.050 0.053 o.o56
9o¢,0 0,015 0.016 0,017 0.019 0+020 0.021 0.022 0°02 4 0.02[OCRerr] 0.026
100.0 O. 000 O. 000 O. 000 O. 000 0.000 o. ooo o° ooo o, ooo o, ooo o,ooo