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. - 177 - FIGURE 4.824T Index Language III. 5. a Exhaust/vity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in Collection Number of Questions 77 (Subset 7) Number of Relevant Documents 454 Generality Number 16.8 (Controlled terms. Helated terms. Coordination) 350 (Subs[OCRerr] 2) Coord- inagon Documents Recall Precision Retrieved Fallout Ratio Level Rel. Non-rel. Ratio a/a+c Ratio a/a+b x b/b+d y z 1 430 2 13.965 350 94.7% 5,896 77.1% 3.0% 5.6% 52.698% 77 77 77 3 211 1,943 48.5% 22.252% 9.8% 77 77 7.333% 77 72 73 73 4 103 441 5 40 22.7% 132 18.9% 8.8% 1.664% 53 53 63 fi 12 27 23.3% 2.8% 0.498% 30.8% 31 0.102% 47 47 9 28 28 7 2 5 8 2 0.4% 3 28.6% 0.4% 0.019% 4 17 17 9 2 1 40.0[OCRerr] 0.4% 0.011% 06.7% 2 11 11 0.004% 2 6 6 10 0 0 0 1 1 FIGURE 4.825T Index Language III. ft. a Exhaust/vity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in Collection Number of Questions 77 (Subset 7) Number of Relevant Documents 454 Generality Number 16.8 (Controlled terms. Narrower, broader and related terms. 350 (Subset 2) Coordination) Coord- Documents Inatioa Recall Retrieved Precision Fallout Level Rel. Non-rel. Ratio aJa+c Ratio Ratio aJa+b b/b+d x y z 1 440 2 15.172 370 98.9% 81.5% 2.8% 4.8% 57.252% 77 77 77 3 7.383 252 2,664 55.5% 27. 865% 8.8% 1o.o54% 77 77 77 72 73 73 4 126 630 5 27.8% 45 187 16.7% 0.0% 2.378% 59 63 83 6 13 36 20.7% 2.8% 0.630% 20.5% 35 0. 136% 47 47 11 28 7 28 2 8 7 2 O. 4% 22.2% 0.4% O. 026% 5 17 17 8 3 2 I 40.0% 0.4% o.ozi% 88.7% 2 11 0.004% i1 2 6 10 6 0 0 I 1