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. - 94 - FIGURE 4. 122T Index Language L 3. a (S. T. Word forms. Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 3.4 Coordination) Coord- Recall Precision Fallout ination I Documents Ratio Ratio Ratio x y z Level I Retrieved I Rel. Non-rel. a/a+c a/a÷b b/b+d 1 191 (-) 96.5% (-) (-) 42 O 42 2 166 11,268' 83.8% 1.5%, I 8. 843[OCRerr]* 42 6" 42 3 139 5.054 70.2% 9..7% 8.624% 42 42 42 4 97 1,497 49.0% 8.1% 2. 555% 39 41 41 5 59 419 29.8% 12.3% 0.715% 26 39 39 6 32 100 16.2% 24.2% 0.171% 17 33 33 7 14 22 7.1% 38.9% 0.038% II 27 27 8 4 6 2.0% 40.0% o. 01 o% 5 18 18 9 0 3 O. 0% O. 0% O. 005% 2 11 11 I0 0 O 0 7 7 II 0 0 0 3 3 12 0 0 0 1 I 13 14 15 FIGURE 4. 123T Index Language I. 5. a (S. T. Synonyms, Quasi-synonyms. Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 3.4 Coordination) Coord- Documents Recall Precision Fallout Ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-tel. a/a+c a/a+b b/b+d 1 195 (-) 98.5% (-} (-} 42 0 42 2 177 13,564* 89.4% 1.3[OCRerr]* 22.682%* 42 6* 42 3 144 9,418 72.7% 1.5% 16.071% 42 42 42 4 117 3.248 59.1% 3.5% 5. 542% 40 41 41 5 73 1,014 30.9% 6.7% I. 730% 33 39 39 6 41 275 20.7% 13.0% 0.469% 24 33 33 7 17 66 8.6% 20.5% 0.113% 16 27 27 8 6 11 3.0% 35.3% 0. 019% fl 18 18 9 5 4 2.5% 55.6% 0.007% 4 II ii I0 0 3 0.0% o. 0% o. 005% 2 7 7 II 0 0 0 3 3 12 0 O 0 1 1 13 14 15