CRANV2 Supplementary tests and results chapter 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. - 226 - FIGURE 6.4T Index Language I.l.a Exhaustivity of Indexing 3 Search Rule A Document Relevance 1-4 Number of Documents in Collection 1400 Number of Questions 94 Basic Questions Number of Relevant Documents 737 Generality Figure 5.6 Coord- Documents Recall inat ion Precision Retrieved Fallout Ratio Level Rel, Non-rel. Ratio a/a+c Ratio a/a+b b]b+d 1 694 69037 I 2 604 94.2% 26777 1.0% 51. 946% 82.0% 3 474 2.2% 10425 64.3% 20.148% 4.3% 7. 844% 4 324 3874 44.0% 5 179 1286 7.7% 2. 914% 6 24.3% 92 12.2% 333 12.5% 0. 967% 21.6% 0.251% 7 49 112 8 14 24 L6% 3 o. 8% o. 082% 9 1.9% 36.8% 3 3 0.4% 0. 018% 50.0% o. 002% FIGURE 6.5T Index Language I.l.a Exhaustivity of Indexing 3 Search Rule A Document Relevance 1-4 Number of Documents in Collection 1400 Number of Questions 127 Supplementary Questions Number of Relevant Documents 853 Generality Figure 4.7 . Coord- Documents ination Recall Retrieved Precision Fallout Level Ratio Rel. Non -rel. Ratio a/a+e Ratio a/a+b b/b+d 1 816 90085 2 679 95.6% 31345 O. 9% 48.174% 3 79.6% 472 11508 2.i% 55.3% 16.762% 3.9% 6. 154% 4 282 3485 5 135 33.1% 7.5% 1. 864% 1094 6 15.6% lO. 8% 62 366 0.585% 7.3% 14.5% o. 195% 7 25 94 8 2.9% 20.7% 8 19 0.049% 9 0.8% 5 26.8% 2 0.6% o. Ol 0% 71.4% 0.001% 10 1 0 0.1% 1 oo. 0% o. 000%