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. - 270 - 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