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. - 113 - FIGURE 4.310T Index Language l.lb (S.T. Natural language. Exhaustivity of Indexing 3 Search Rule B Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 19 (Subset 4) Number of Relevant Documents 131 Generality Number 4.9 Coordination, Partitioning) Coord- Documents £n,[OCRerr]t ion RecaLl Retrieved Precision FaLlout Level Ratio Rel. Non-re1. a/a+c Ratio Ratio a/a+b b/b+d x y z I Ii3 (-) 2 86.3% (-) (_) 93 (-) 19 O 19 3 60 71.0% 496* (-) (:) 45.8% 10.7%. 19 10.876=[OCRerr]. 0 19 19 4 7* 19 26 75 5 19.6% 9 2,5.7% 6.9% 0.283% 12 19 19 6 5 7 0 64.3% 5.3% 0.019% ZOO. O% 2 19 0.000% 19 2 7 19 19 4 8 0 3.1% 100.0% 0.000% 2 19 19 9 I0 11 12 13 14 15 FIGURE 4.311T Index Language I. ib (S. T. Natural language. Exhaustlvity of Indexing 3 Search Rule R Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 17 (Subset 5) Number of Relevant Documents 109 Generality Number 4,6 Coordination. Partitioning) Coord- Documents irmtion Retrieved [ Recall Rel. Non-re1. I Precision Fallout Level Ratio a/a+c Ratio a]a+b Ratio b/b+d x y z to8 (-) 99.1% (-) 97 (-) (-) 89.0% 17 (-) 0 17 (-) 79 (-) 72.5% (-) 17 0 (-) 17 17 0 17 55 (-) 50.5% 35 (-) (-) 228 17 O 17 20 32.1% 44 15.4% 18.3% 0,962% 31.3% 15 0.186% 17 17 11 17 17 I0 O 6 17 17 o o 9,2% 6 100.0% o i 5.5% 0.000% Ioo. 0% 0.000% 4 17 17 o O 17 o J 17 O 0 0 17 17 0 17 17 15 i L__. 1