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. - 281 - Table of Falloul Ratios for a Generality Number of 25.0 E[OCRerr] 5 1o i5 2o 25 3o 35 4° 45 50 P o.5 25.5*3 51.o26 76.533 1,o 12.692 25.385 58.077 5o.769 63.462 76.154 88.846 2.o 6,282 12.564 18"356 25"128 3I°41° 37-692 43-974 50-256 $6o538 62.821 3.0 4.145 8.29* 12.436 .6.581 20.726 2 4.872 29,oi7 33.162 37.508 41,453 4. o 3.077 6,124 9.231 12.3o8 15.385 IS.462 21.238 24.615 27.692 30.769 5,0 2"436 4"872 7.3°8 9.744 12-179 14.615 17.o5* 19.487 21.923 24.359 7,5 *-581 3,162 4-744 6,525 7.906 9,487 11.o6[OCRerr] 12.6So 14.231 15.812 io.o t.154 =.3o8 3.462 4.6t5 5.769 6.923 8.o77 9,23* 1o.385 11,538 *2-5 o,897 *.795 2.692 3,59o 4.487 5.385 6.[OCRerr]82 7.179 8.077 8.974 15-° 0.726 *,453 2.179 2.9o6 3,632 4-359 5-085 5.812 6,538 7.265 2o,o o,515 1.o26 1.538 3,o51 2-564 3.077 3,59o 4. io3 4.615 5.128 25. o o.38S 0.769 *.154 1.538 1,933 2.308 2.692 3.077 3,[OCRerr]62 3,846 30.0 0.299 0.598 o,897 %.197 1.496 1.795 [OCRerr].o94 2-393 3.692 2.99* 35. o 0.238 0.476 o.714 o.9[OCRerr]2 1.19o 1.439 1.667 1.9o5 2.143 2.381 40.0 o.192 o.38S o.$77 0.769 o.962 1.154 1.346 [OCRerr].538 1.731 1.923 45.0 o..57 o.313 0.470 o.627 0.785 o,94o [OCRerr],o97 1.254 1.410 1.567 5o.o o.128 o.226 0.385 o,Si3 o,641 0.769 0.897 I.o26 [OCRerr]-[OCRerr]54 1.282 25.o o. Io5 o.21o o.315 o.42o 0-524 o,629 o.734 0.839 0o944 1.o49 6o.o 0.085 o.171 o.2[OCRerr]6 o.3[OCRerr] 0.427 0.5,3 0.598 o.684 o.769 0.855 65"0 0-069 °-132 °,2o7 o,376 0-345 o, 414 0.483 0,552 0.621 0.690 70,0 0,o55 o,ilo o.165 0.220 0,275 0.330 0.385 0.440 0.495 o,549 75,0 o,o43 0.085 o.128 o,171 o,314 o.[OCRerr]56 o.299 o,342 0.385 o. [OCRerr] 7 80.0 0.032 0.o64 0.096 o.t28 o.16o o.,92 o.224 0.256 o.288 o.331 85.0 0.023 0.045 o.o68 0.090 o. II3 0.136 0.158 o.181 0.204 0.226 90.0 o.oI4 0.028 o.o43 0.057 o.o71 o,o85 o.*oo o.**4 0,[OCRerr]28 o.1 95.0 0.007 o.o13 o.o3o o.o27 0-034 0.040 oDo47 o.o54 o,o61 0.067 100,0 0. oo0 o.0oo o.ooo o.ooo o,ooo o.ooo o.ooo o.ooo o.ooo o.oo0 R* 55 60 6< 70 75 80 85 9° 95 ioo p 0,5 1.o 2.o 69.1o3 75"385 81,667 87-949 94.[OCRerr]31 3"° 45"598 49-744 53.889 58,o34 62.179 66.325 70.470 74.615 78.761 82.906 4,0 33,846 36.923 4o.ooo 43.077 46.154 49,231 53.3o8 55,385 58,463 6.,538 5.0 26.795 29.[OCRerr]31 31.667 34.1o3 36,538 38.974 41.41o 43,846 46.282 48,718 7,5 17,393 18"974 3o,556 23.137 23.7*8 [OCRerr]5.299 36.880 28.462 30,043 3,,6[OCRerr]4 iO, O .2,692 13,846 15,ooo ,6,,54 17.308 18.462 19.61s 2o.769 21.9s3 23.077 Is'5 9"872 10"769 11"667 12"564 13"463 '4-3[OCRerr]9 15,256 16-'54 *7-05* '7-949 15-o 7-99* 8,718 9-444 .0,171 1o.897 ti-624 12-35o *3.077 13.8o3 14.53o 2o.o 5,641 6,154 6.867 7.179 7.692 8.[OCRerr]o5 8.[OCRerr]18 9.[OCRerr]3, 9-744 1o-256 25.o 4.[OCRerr]31 4.6*5 5,ooo 5,385 5,769 6.154 6.[OCRerr]38 6.923 7.308 7.692 30,0 3,291 3,59° 3.889 4.,88 4.487 4,786 5.085 5.385 5,684 5.983 35"0 s'619 2"857 3"°95 3,333 3-57* 3.81o 4.048 4.286 4,[OCRerr]24 4.762 40,0 2,115 3.308 2.5oo 2.692 3,885 3,077 3.[OCRerr]69 3o463 5,654 3,846 45.0 1.724 1.88o 3.o57 3,194 3,350 2.507 2,664 [OCRerr].82[OCRerr] 2.977 3.134 SO, O 1.41o 1.538 I'667 [OCRerr]£-795 1,923 2,o51 s.179 2.308 [OCRerr].436 3,564 [OCRerr]5-° *-i54 *'[OCRerr]59 1,364 1.469 *-573 [OCRerr].678 t.783 [OCRerr].888 *-993 2.oq8 60,0 0[OCRerr]94o 1.o26 1.111 I.,97 1.382 1.368 1-453 1.538 1,6[OCRerr]4 1.7o9 65,o 0-759 0.828 0.897 o.966 [OCRerr].o56 l'i°5 *-[OCRerr]74 1,243 1.3[OCRerr]2 *,381 7o, o o.6o4 0,659 o%714 0.769 0.834 0.879 0.934 0,989 [OCRerr],o44 1,o99 75"0 0"470 °'513 °°155 °'598 o-641 " o.684 0.726 0.769 o.8x2 0.855 80,0 o.553 0.385 o.417 0.449 0,481 °'[OCRerr]13 °'545 0"577 o.6o9 0,64* 85.0 0.=49 o.271 o.29[OCRerr] 0.317 o.339 0.362 0.385 0.407 0.430 0,452 90.0 o, i57 o.[OCRerr]71 o.185 o.199 o,214 0.228 o,242 0.256 0,27* o,38[OCRerr] 95. o 0.074 o.o81 0.088 o.o94 0.i0* 0. Io8 o.[OCRerr]5 o.121 0,[OCRerr]28 o.i35 [OCRerr]oo,o o,ooo, o,ooo o.ooo o.ooo o.ooo oeooo o.ooo oeooo o,ooo o,ooo