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. - 133 - FIGURE 4. 500T Index Language I. 1. a (S.T. Natural language. Exhaustivity of Indexing 3 Search Rule A 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 Coo rdinat ion) ' Coord- Documents RecaLl Precision Fallout Jnation Retrieved Ratio R atio Ratio x y z Level Rel. Non-rel. a/a+c a/a-[OCRerr]b b/b+d i 118 12,700 90.1% 0.9% 47.744% 19 19 19 2 100 4,294 76.3% 2.4% 19 19 19 3 72 55.0% 16.143% 1.426 5.0% 5.360% 19 19 19 4 39 188 29.8% 17.2% 0.710% 15 19 19 5 16 16 13.7% 52.9% 0.060% 8 10 19 6 10 3 7.6% 76.9% 0.011% 2 19 19 7 4 0 3.1% 10O.0% 0.000% 2 19 19 FIGURE 4. 501T Index Language I. 1 .a (S.T. Natural language. Exhaustlvity of Indexing 3 Search Rule A 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) Coord- Documents Recall Precision Fallout ination Retrieved Ratio Level Ratio Ratio Rel. Non-rel. a/a+c a/a+b x y z b/b+d 1 108 2 14,710 105 99.1% 8,030 0.7% 96.3% 61.807% 17 17 17 3 91 1.3% 3,652 83.5% 33.730% 17 2.4% 17 17 15.344% 17 17 17 4 74 5 1,559 67.9% 4.5% 52 818 47.7% 6.550% 17 17 17 6 39 237 7.8% 35.8% 2.609% 17 17 14.1% 17 1.000% 15 17 17 7 22 100 8 13 20.2% 18.0% 22 0.422% 14 17 17 9 11.9% 6 37.1% 10 4 5,5% 0.093% 17 17 60.0% 0.017% 5 17 17 I0 1 0 11 0.9% 0 100.0% 1 0 0.000% 17 17 0 17 17