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. - 165 - FIGURE 4. 804T Index Language IH. 5.a (Controlled terms. Related terms. Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection 200 (Subset 1) Number of Questions 42 (Subset 2) Number of Relevant Documents 42 (Subset 2) Generality Number 23.6 CoordLnat ion) Coord- Documents Ination Recall Retrieved Precision Ratio Fallout Level Rel. Non-rel. a/a+c Ra[OCRerr]o Ra[OCRerr]o a/a+b b/b+d x y z 1 195 5.424 2 184 98,5% 3.4% 92.9% 86,148% 42 42 42 3 3,044 133 1,252 5.7% 87.2% 37.113% 9.6% 15.265% 42 42 42 41 41 4 41 62 420 8 35 122 31.3% 12.9% 17.7% 5.121% 29 34 34 8 12 26 . 22.3% 6.1% 1.487% 31.8% 19 0.317% 24 24 7 13 7 13 4 7 8 2 2.0% 3 36.4% l.O% 0.085% 3 8 8 9 2 1 4o.o[OCRerr] 1.0% 0.037% 2 66.7% 0.012% 4 4 2 3 3 7o 6o J CE 40 3o \ \ IO \ \ \ \\ \ \, 20 30 40 50 60 °/o PRECISION o~,'- 7O 80 90 ioo FIGURE 4. 804P INDEX LANGUAGE III. 5. a (Index Language III. 1. a Broken line)