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. - 180 - FIGURE 4. 831T Index Language III. 6.e (Controlled terms. Exhausttvity of Indexing 3 Search Hule E Document Relevance 1 - 4 Number of Documents in Collection 200 (Subset 1) Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 Narrower, broader and related terms, Coordination weighting) Coord- Documents Recall Precision Fallout Ination Retrieved Ratio RaUo Ratio x y z Level Rel. Non-tel. a/a+c a/a+b b/b+d I I92 (-) 97.0% (-) (-) 42 0 42 2 137 1,134 69.2% 10.8% 13.820% 41 42 42 3 88 345 44.4% 20.3% 4.206% 38 41 41 4 39 56 19.7% 41.1% 0.683% 24 34 34 5 20 15 10.1% 57.1% 0.183% II 24 24 6 8 2 4.0% 80.0% 0.024% 3 13 13 7 0 0 0 8 8 8 0 0 0 4 4 9 0 0 0 3 3 oo , I 9O so 3o io o 1o 20 30 4o so 6o 7o no 9o [OCRerr]oo °I[OCRerr], PRECISION FIGURE 4.831P INDEX LANGUAGE lll.6.e SEARCH E (Index Language III.6.a Broken line)