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. - 164 - FIGURE 4. 803T Index Language lll.4.a (Controlled terms. Narrower and Broader terma. Coordination) Exhausttvity of Indexing 3 Search Rule A Document Relevance I - 4 Number of Documents in Collection 200 (Subset !) Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 Coord- Documents Recall Precision FaLlout ination Retrieved Ratio Ratio Ratio x y z Level Re1. Non-re1. a/a+c a/a[OCRerr]b b/b+d I 180 3.614 90.9% 4.7% 44.073 42 42 42 2 148 1,661 74.7% 8.2% 20.251% 42 42 42 3 94 386 47.5% 19.6% 4.706% 37 41 41 4 44 82 22.2% 34.9% 1.000% 23 34 34 5 18 12 9.1% 60.0% 0.146% 8 24 24 6 8 3 4.0% 72.7% 0.037% 4 13 13 7 2 2 1.0% 50.0% O. 024% 2 8 8 8 1 1 0.5% 50.0% 0.012% 2 4 4 9 0 0 0 3 3 ioo 9o 8o 30 0 .\ \ 20 30 .40 SO 60 70 80 90 IOO °to PP, ECIStON FIGURE 4.803P INDEX LANGUAGE iII. 4. a (Index Language HI. 1. a Broken llne)