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. - 162 - FIGURE 4. 801T Index Language III. 2,a (Controlled terms. Narrower terms. Coordination} Exlmuotivity of Indexing 3 Search Rule A Document Relevance I - 4 Number of Documents in CoLlection 200 (Subset I) Number of Questions 42 (Subset 2) Number of Helevant Documents 198 GeneraLity Number 23.6 Coord- Documents RecaLl Precision Fallout ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-rel. a/a+c a/a+b b/b+d 1 176 3.062 88.9% 5.4% 37.34% 42 42 42 2 137 1.024 69.2% 11.8% 12.485% 42 42 42 3 83 232 41.9% 26.3% 2.829% 31 41 41 4 38 53 19.2% 41.8% 0.646% 20 34 34 5 17 9 8.6% 65.4% 0.110% 6 24 24 6 6 3 3.0% 66.7% O. 037% 3 13 13 ? 2 2 1.0% 50.0% 0.012% 2 8 8 8 1 1 0.5% 50.0[OCRerr] 0.012% 2 4 4 9 0 0 0 3 3 8o 7o 60 -J -J <[ U SO rr 40 3O 2O IO \ o IO 20 30 FIGURE 4.801P \ 40 $O 60 70 °/o PP, ECI SION 80 9o IOO INDEX LANGUAGE Ill 2 a (Index Language ILL 1. a Broken line)