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. - 107 - FIGURE 4.206T Index Language 1.9a {S.T. Synonyrils., Third hierarchical reduction. 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 198 Generality Number 23.6 Coordination) Coord- Documents Ination Retrieved RecaH Precision Fallout Level Rel. Non-rel. Ratio a/a[OCRerr]c Ratio a/a+b Ratio b/b+d x y = 1 195 2 181 6,576 3,990 98.5% 2.8% 91.4% 42 42 42 42 82.3% 4.3% 78.936% 3 , 163 2,034 48.647% 7.4% 42 42 42 4 24.799% 127 42 42 5 959 83 64.1% 403 11.7% 41.9% 17.1% 11.692% 39 41 41 6 46 171 23.2% 4.913% 21.2% 32 30 30 7 2.085% 25 33 33 8 22 42 11.1% 34.4% 3.5% 70.0% 0.512% 14 27 27 9 7 3 4 1 2.0% 80.0% 0. 037% 3 18 18 10 0,012% 1 2 11 I1 11 0 0.5% 100.0% 0.000% 1 7 7 12 0 0 0 0 0 3 3 13 0 1 1 14 15 IOO 0o\ 7O 60 .-J -J [OCRerr] so n.- [OCRerr] 4o 3o 2o io \ =o so 40 so 60 7o eo 90 mo % PFLECISlON