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. - 112 - YtGU[OCRerr]E [OCRerr]. 302') Index Language 1.Sa {S.T. Syr, onym[OCRerr], Quasi-synonyms, Word forms. Exhaustivity of Indexing 3 Search [OCRerr]uIe B Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 19 (Subset 4) Number of Relevant Documents 131 Genershty Number 4.9 Coordination} Coord- Recall Precision FaVour ination I Ratio Ratio Ratio x y z Level I Documents Retrieved i .Rel" Non-rel. a/a+c ala+b b/b+d 1 12o (-) 01.8% (-) (-) 19 0 2 86.3% (-) 19 (-) 19 0 3 i 1i3 (-) [ 19 71.0% 3.6%* 9. 237%* 19 7" 19 4 I 93 2,457* [ 58 765 44.3% 19 5 7.0% 2. 890% 19 19 22.1% 20.9% 00416% 15 19 6 I [, 29 110 19 17 29 13.0% 37.0% 0.110% 7 19 19 7 } } 8 7 6.1% 53.3% 0.026% 3 19 19 8 I 11 13 I 14 is I ! FIGURE 4. 303T Index Language 1.6a (S.T. Synonyms, Quasi-synonyms, Word forms. Coordination} Exhaustivity of Indexing 3 Search Rule B Document Relevance I - 4 Number of Documents in Collection 1,400 Number of Questions 17 (Subset 5) Number of Relevant Documents 109 Generality Nu tuber 4.6 Coord- Documents Recall Precision Fallout Ination Retrieved Ratio Ratio Ratio x y z Level R el. Non-rel. a/a+c a/a+b b/b+d 17 0 17 17 0 17 17 0 17 17 0 17 17 17 17 17 17 17 16 17 17 14 17 17 7 17 17 I0 1 17 17 II 0 17 17 12 13 14 15 I i