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. - 172 - FIGURE 4. 814T Index Language Ill. 5.a Exhaustiv[OCRerr]ty of Indexing 3 Search Rule E Document Relevance I - 4 Number of Documents in Collectiou Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 (Controlled terms. Related tcrms. Coordination) 200 (Subset 1) Coord- Documents Recall Precision Fallout Ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-rel. a/a+c a]a+b b]b+d t 1 194 4,339 98.0% 4.3% 52.914% 42 42 42 2 156 1,660 78.8% 8.6% 20.239% 42 42 42 3 104 628 52.5% 14.2% 7.657% 40 41 41 4 48 155 24.2% 23.6% 1.890% 27 34 34 5 27 47 13.6% 36.5% 0.573% 17 24 24 6 11 I0 5.6% 52.4% 0.122% 5 13 13 7 2 2 1.0% 50.0% 0. 024% 2 8 8 8 2 2 1.0% 5o. 0% o. 024% 2 4 4 9 2 I 1.0% 66.7% o.o12% 2 3 3 9o 7o 6O .--I -J rf o [OCRerr]- 40 30 20 I0 \ \ \ \ \ \ \ \ o IO 20 30 k \ --t 40 50 60 70 °/o P[OCRerr]ECISION 80 90 I00 FIGURE 4. 814P INDEX LANGUAGE IlL 5. a SEARCH E 200 DOCUMENTS (Index Language IIL 1. a Broken line)