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. - 169 - FIGURE 4.811T Index Language III. 2.a Exhaustlvity 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 [OCRerr]erms. Narrower terms. 200 (Subset I) Coordination) Coord- ination Level 1 2 3 4 5 6 7 8 9 Documents Retrieved Rel. Non-tel. 171 2, o[OCRerr]4 116 455 84 1 O0 28 14 11 4 0 2 0 1 0 1 0 0 RecaLl Precision Fallout RatioRatio Ratio a/a+ca/a+b b]b+d 86.4% 7.6% 25.414% 58.6% 20.3% 5,547% 32.3% 39.0% 1.219% 14.1% 66.7% 0.171% 5.6% 73.3% 0. 049% 0.0% 0.0% 0. 024% o. 0% o. o% o. Ol 2% O. 0% O. 0% O. Ol 2[OCRerr] o. 0% o. 0% o. o12% x y z 42 42 42 39 42 42 29 41 41 15 34 34 6 24 24 1 13 13 l 8 8 I 4 4 0 3 3 9o 8O 60 .J .J <t so cr 40 .... 3O 20 I0 0 1o J 20 30 40 50 60 70 °/° P[OCRerr]ECISION 8o 90 I00 FIGURE 4. 811P INDEX LANGUAGE IIL 2. a SEARCH E 200 DOCUMENTS (Index Language IIL 1. a Broken line)