CRANV2 Test Environment 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. 29 - Index Language Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection Number of Questions 35 (subset 1) Number of Relevant Documents 287 Generality Number 5.9 L 5. a (S. T. Synonyms, Quasi-synonyms. 1.400 Coordinati on) 3oord- Documents Recall [OCRerr]ation Precision Retrieved Fallout Level Ratio Ratio Rel. Non-rel. a/a+c Ratio a/a+b x b/b+d y z 1 280 (-) 97.6% (-) (_) 2 253 17,130. 88,2% 35 1.5%* 0 35 3 194 34. 959%* 7,472 67.6% 35 2.5% 23* 35 15.339% 35 35 35 4 125 2,086 43.6% 5 5.6% 65 463 4. 282% 34 22.7% 35 35 12.3% 6 35 0.950% 88 12.2% 30 28.4% 35 35 0.181% 16 35 35 7 11 18 3.9% 38.0% 0. 037% 5 35 35 FIGURE 2.15 SAMPLE TABLE OF TEST RESULTS !