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. - 175 - FIGURE 4. 820T Index Language III. 1 .a (Controlled terms. Basic terms. Exhausttvity of Indexing 3 Search Rule E Document Relevance I - 4 Number of Documents in CoLlection 350 (Subset 2) Number of Questions 77 (Subset 7) Number of Relevant Documents 454 Generality Number 16.8 Coordination} Coord- Documents Recall ination Precision Retrieved Fallout Ratio Level Bel. Non-rel. Ratio a/a+c Ratio a/a+b x b/b+d y z 1 361 6,320 2 231 79.5% 5.4% 1.413 50.9% 23.849% 77 77 77 3 109 289 14.1% 24.0% 5.333% 27.4% 73 1.091% 77 77 54 73 73 4 40 31 5 13 8.8% 6 56.3% 2.9% 0.117% 23 63 63 6 0 2 58.4% 0.0% 0.023% 0.0% 9 0.008% 47 47 1 28 28 7 0 1 8 0.0% 0 1 0.0% o.o% 0.004% 1 17 17 9 0 0 0.0% 0.004% l 11 11 0 6 6 10 0 0 0 1 1 FIGURE 4. 821T Index Language Ill. 2.a (Controlled terms. Narrower terms. Exhausttvity of Indexing 3 Search Rule E Document Relevance I - 4 Number of Documents in Collection 350 (Subset 2) Number of Questions 77 (Subset 7) Number of Relevant Documents 454 GeneraLity Number 16.8 Coordination) Coord- Documents Ination RecaLl Precision Ratio Fallout Level Retrieved Rel. Non-rel. a/a+c Ratio a/a+b Ratio b/b+d x y z 1 377 2 d,762 245 83.0% 54.0% 5.3% 77 77 77 24.9% 13.6% 25.516% 3 1,554 113 335 25.2% 5.865% 73 77 77 4 1. 284% 46 54 73 73 5 35 13 10.1% 56.8% 2.9% 0.132% 25 63 63 6 6 0 2 o. 0% 68.4% o. 0% 0.023% 9 47 47 7 o. 008% 1 0 28 28 8 1 0 O. 0% O. 0% O. 0% O. 004% i 17 17 9 1 0 0 O, 0% O. 004% 1 11 11 10 0 0 6 6 0 0 1 I