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. - 171 - FIGURE 4.813T Index Language tII.4.a Exhaustivity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in CoLlection Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 (Controlled terms. Narrower and broader terms. 200 (Subset I) Coord- ination Level 1 2 3 4 5 6 7 8 9 Documents Retrieved Rel. Non-rel. 175 2,854 129 797 81 180 34 24 13 6 2 2 0 1 O I 0 0 RecaLl Precision Fallout RatioRatio Ratio a/a+ca/a+b b/b+d 88.4% 5.8% 34. 804% 65.2% 13.9% 9.717% 40.9% 31.0% 2.195% 17.2% 58.6% 0.2926% 6.6% 66.4% 0.073% 1.0% 50.0% 0.024% O. 0% O. [OCRerr]o O. oz 2% o. 0% o. 0% o. o12% 42 42 42 39 42 42 35 41 41 19 34 34 7 24 24 2 13 13 I 8 8 1 4 4 0 3 3 Coordinat ion) 60 .J ._I so 4o IOO l]II I l J b \ 1 ,% ! 90 80 70 30 20 IO o [OCRerr]o 20 30 4o 50 6o ?o so [OCRerr]o ,oo °/o PRECISION FIGURE 4. 813P INDEX LANGUAGE lit. 4. a SEARCH E 200 DOCUMENTS (Index Language IIL 1. a Broken llne)