CRANV2 Main test 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. - 115 - FIGURE 4. 320T [OCRerr].ndex Language I. le (S.T. Natural language. Coordination. Interfixing) Exhaustivity of Indexing 3 Search Rule B Document Relevance 1 - 4 Number of Documents in CoLlection 1,400 Number of Questions 19 4Subset 4) Number of Relevant Documents 131 Generality Number 4.9 Coord- Documents ination Recali Retrieved Precision Fallout Level Ratio Rel. Non-rel. Ratio a/a+c Ratio ala+b b/b+d x y z 1 113 (-) 2 92 (-) 86.3% 70.2% 4-) 19 0 19 38.9% 4-} 4-) 3 51 358* 4-) 12.5%* 19 0 1.346%* 19 19 7* 19 4 25 54 5 19.1% 0 0 31.8% 8.1% 0.204% 12 19 19 6 4 100.0% 0 3. I% 0. 000% 100.0% 2 19 0. 000[OCRerr] 19 1 19 19 7 3 0 8 2.3% 100.0% O. 000[OCRerr] 1 19 19 9 1o 11 12 13 14 15 FIGURE 4.321T Index Language I. le (S.T. Natural language. Exhauetivity of Indexing 3 Search Rule B Document Relevance I - 4 Number of Documents in Collection 1.400 Number of Questions 17 (Subset 5) Number of Relevant Documents 109 Generality Number 4.6 Coordination, Interfixing) Coord- Documents RecaU Precision FaHout ination Retrieved Level Ratio Ratio Rel. Non-tel. a[a+c Ratio a]a+b y b[b+d x z 1 lo8 (-} 99.1% 2 87 (-) 4-) 17 89.0% 0 17 7S.2% 4-) 4-) 3 82 (-) (-) 17 (-) 4-) 0 17 17 0 17 4 62 (-) . 5 48 56.9% 296 17 44.0% 4-) O 17 14.0% 4-) 6 26 118 1. 249% 17 17 23.9% 17 19.1% 0.498% 14 17 17 7 12 25 8 11.0% 7 32.4% 0.106% 17 0 6.4% 8 17 9 1 100.0% O. 000% 4 17 : 0 o. 9% i oo. 0% 17 o. 000% 1 17 17 I0 0 0 II 0 0 0 17 17 12 0 17 17 13 14 15