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. 170 FIGURE 4.812T Index Language III. 3. a Exhaustlvity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in Co[OCRerr]Aection Number of Queetione 42 (Subset 2) Number of Relevant Doeumente 198 Generality Number 23.6 (Ccntrolled terms. Broader terms. 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 1 173 2,758 87.4% 5.9% 42 42 2 117 762 59.1% 13.3% 33.634% 42 9.290% 39 42 3 42 79 172 39.9% 31.5% 2.097% 35 41 41 4 31 24 15.7% 50.4% 0.2020% 19 34 5 12 34 5 6.1% 70.6% 0.0609% 7 24 6 2 24 2 1.0% 50.0% 0.024% 2 13 13 7 0 1 0.0% 0.0% 0.012% 1 6 8 0 1 0.0% 0.0% 8 0.012% 1 4 9 0 4 0 O 3 3 ioo 8o 7o 3O 20 \ ^\ io 20 3O ;k X 40 50 60 70 % PRECISION 8o 9o ioo FIGURE 4. 812P INDEX LANGUAGE IIL 3. a SEARCH E 200 DOCUMENTS (Index Language IlL 1. a Broken line)