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. - 106 FIGURE 4. 205T Lndex Language I. 8a (S. T. Synonyms, Second hierarchical redaction. 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 198 Generality Number 23.6 Coordination) Coord- | ] Recall Precision FaLlout Ratio Ratio Ratio x y z Level l Documeuts irvation Retrieved Rel. Non-rel. a / a+c a/a+h b/b+d 1 193 4,954 97.5% 3.7% 60.409% 42 42 42 2 173 2,551 87.4% 6,4% 31.102% 42 42 42 3 146 1,081 73.7% 11.9% 13.180% 42 42 42 4 104 418 52.5% 19.9% 5.096% 37 41 41 5 67 146 33.8% 31.5% 1.780% 27 39 39 6 33 37 16.7% 47.1% 0.451% 21 33 33 7 12 7 6.1% 63.2% 0.085% 8 27 27 8 5 1 2.5% 83.3% 0.012% 2 16 18 9 2 0 1.o% loo.o% 0.000% 1 11 11 10 0 0 0 7 7 11 0 0 0 3 3 !2 0 0 0 1 1 13 14 15 \\ 40 50 60 70 80 90 tOO °/,, PRECISION