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. - 168 - FIGURE 4. 810T Index Language III. 1 .a (Controlled terms. Basic terms. Exhaustivity of Indexing 3 Search Rule E Document Relevance 1 - 4 Number of Documents in Collection 200 (Subset 1) Number of Questions 42 (Subset 2) Number of Relevant Documents 19[OCRerr] Generality Number 23.6 Coordination) Coord- Documents RecaH Precision Fallout ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-rel. a]a+c a]a+h blbed 1 169 1,933 85.4% 8.0% 23,573% 42 42 42 2 114 428 57.6% 21.0% 5.219% 39 42 42 3 62 92 31.3% 40.3% 1.122% 29 41 41 4 25 13 12.6% 65.8% 0.159% 15 34 34 5 10 4 5.1% 71,4% 0.049% 9 24 24 6 0 2 0.0% 0.0% 0.024% 1 13 13 7 0 1 0.0% 0.0% 0.012% 1 8 8 8 0 1 0.0% 0.0% o.o12% 1 4 4 9 0 0 0.0% 0,0% 0.012% 0 3 3 \ \ " I 20 Jo o io [OCRerr]o Ioo 9o 80 60 -J -J (,-," 50 uJ h- e 4o 3o FIGURE 4.810P i \ 30 40 50 60 70 °to PP, ECI SION INDEX LANGUAGE Hi l.a 200 DOCUMENTS 80 90 ioo SEARCH E