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. - 176 - FIGURE 4.822T Index Language lII, 3. a (Controlled terms. Broader terms. Coordination) Exhaustivity 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 16.6 350 (Subset 2) Coord- Documents Recall Precision Fallout ination Retrieved Ratio Ratio Level Rel. Non-rel. Ratio a/a÷e a/a+b x y z b/b+d 1 376 9,202 82.8 2 259 2,562 57.0% 3.9% 77 9.2% 37.724% 77 77 3 138 496 30.4% 9.669% 73 21.8% 77 1.872% 77 60 73 73 4 53 65 11.7% 5 18 44.0% 9 0.245% 31 63 63 6 4.0% 2 66.7% 3 0. 034% 0.4% 14 47 40.0% 47 0.0lit 3 28 28 7 0 1 O. 0% 8 0 O. 0% 1 O. 004% O. 0% 1 17 17 9 0 O. 0% O. 004% 0 l ll II 0 6 6 10 0 0 0 1 I FIGURE 4. 823T Index Language III.4.a (Controlled terms. Narrower and Broader terms. Exhauativity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in Collection 350 (Subset 2) Number of Questions 77 (Subset 7) Number of Relevant Documents .454 Generality Number 16.8 Coordinat ion) Coord- Documents Recall Precision Fallout ination Retrieved Ratio Ratio Level Ratio Rel. Non-rel. a/a+c x y z a]a+b b/b+d 1 394 2 9,369 276 86.8% 2,757 60.8% 4.0% 9.1% 35.354% 77 46.9% 10.405% 77 77 3 213 599 73 77 26.2% 77 2.261% 60 73 73 4 58 73 5 18 12.8% 11 44.3% 4.0% 0.276% 33 63 63 6 2 62.1% 3 0.042% 14 0.4% 47 40.0% 47 0,011% 3 28 28 7 0 8 1 0.0% 0 1 0.0% 0.0% 0.004% 1 17 17 9 0 0.0% 0 0. 004% 1 1l li 0 6 6 10 0 0 0 1 1