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. - 98 - FIGURE 4. 140T Index Language L I. a (S. T. Natural language. Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection 200 (Subset I) Number of Questions 42 (Subset 2) Number of Relevant Documents 196 Generality Number 23.6 Coordination) Coord- 1 2 3 4 5 6 7 fl 9 10 11 12 Document8 Retrieved Rel. Non-rel. !89 4,072 182 1,929 132 761 88 241 49 80 25 17 12 2 4 1 0 1 0 0 0 0 0 0 Recall Precis:on FaLlout Ratio Ratio Ratio a/a+e a/aeb b/b+d 95.5% 4.4% 49.632% 81.8% 7.7% 23,519% 66.7% 14.8% 9.278% 44.4% 26.7% 2.938% 24.7% 3a.0[OCRerr] 0.975% 12.6% 59.5% 0.207% 6.1% 85,7% 0,024% 2.0% 80.0% 0.012% 0.0% 0.0% 0.012% x y z 42 42 42 42 42 42 42 42 42 34 41 41 23 39 39 15 33 33 6 27 27 2 18 18 1 Ii 11 0 7 ? 0 3 3 0 1 1 ioo 80 L [OCRerr] 60 - \ _1 < .,U 5o \ o [OCRerr] 40 30 20 o \ \ \ [OCRerr] 200 document collection (Fig. 4. 0 [OCRerr] -- -- 1400 document collection (Fig. 4 I t "[OCRerr] [OCRerr]..o[OCRerr].[OCRerr][OCRerr] [OCRerr] [OCRerr] 30 40 50 50 70 80 90 °/o PR£CISION \ 2o 140T) 120T) ioo