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. - 101 - FIGURE 4. 200T Index Language I. 2a Exhaustlvity of Indexing 3 Search Ride A Document Relevance 1 - 4 Number of Documents in Collection Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Nuraber 23.6 (S. T. Synonyn[OCRerr]s. Coordination) 200 (Subset I) Coord - DoculllelltS Reca[OCRerr] Precision Ination FaHout Retrieved Ratio Level Ratio Ret. Non-rel. Ratio a/a+c a/a.b x y b]b+d z 1 189 2 4.193 95.5% 4.3% 165 2,092 51.147% 42 42 42 3 134 83.3% 7.3% 837 25.506% 42 67.7% 42 13.8% 42 10.205% 42 42 42 4 90 282 45.5% 5 24.2% 55 34 41 94 3.438% 41 6 27.8% 36.9% 25 23 1.146% 12.6% 24 39 39 52.1% 0.280% 15 33 33 7 12 2 6.1% 8 85.7% 0.024% 6 4 1 27 27 O 2.0% 80.0% O 0.012% 2 18 ] 0.0% 18 0.0% 0.012% 1 11 11 10 0 0 11 0 0 0 7 7 12 0 0 0 3 3 0 1 1 13 14 15 ioo 9o 8o ; 7o ao \ \ \ [OCRerr]o 3O 40 SO 60 °/* PRECISION 70 80 90 I00 i.