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. - 126 - FIGURE 4.412T Index Language 1.6.a (S.T. Synonyms. Quasi-synonyms. Word forms. Exhaustivity of Indexing 2 Search Rule A Document Relevance i - 4 Number of Documents in Col2ection 1,400 Number of Questions 35 (Subset I) Number of Relevant Documents 287 Generality Number 5.9 Coordtnat ton) Coord- Recall Precision Fallout Inatinn Ratio Ratio Ratio x y Level a/a+c a/a+b b/b+d I I Documents Retrieved Rel. Non-tel. 276 (-) e6.2% (-) (-) 36 0 35 2 247 15,946" 06.1% 1.5%* 32.542%* 35 23* 35 $ 187 6,567 65.2% 2.8% 13.481% 35 35 35 4 114 1,742 36.8% 0.1% 3.676% 32 35 35 5 60 397 21.0% 13.1% 0.815% 25 35 35 6 37 62 12.9% 37.4% 0.127% 10 35 35 7 12 13 4.2% 48.0% 0.027% 5 35 35 FIGURE 4.413T Index Language 1.6.a (S.T. Synonyms, Quasi-synonyms, Word forms. Coordination) Exhaastivity of Indexing I Search Bale A Document Relevance I - 4 Number of Documents in Collection 1,400 Number of Questions 35 (Subset I) Number of Relevant Documents 287 Generality Number 5.9 Coord- Doeumer[OCRerr]s Recall Precision Fallout Ination Retrieved Ratio Batlo Ratio x y = Level Rel. Non-rel. a/a+c a/a÷b b/b+d 1 257 (-) 69.[OCRerr]% (-) (-) 35 0 35 2 215 8,415" 75.0% 2.5[OCRerr]f[OCRerr] 17.176%* 35 23* 35 3 142 2,901 49.6% 4.7% 6.955% 34 35 35 4 74 536 25.8% 12.1% i.io6% 30 36 35 5 32 85 11.2% 27.4% o.174% 14 35 35 6 12 5 4.2% 70.6% 0.610% 6 35 35 6 2 2. i % 76.0% o. 004% 3 35 35