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. - 163 - FIGURE 4. 802T Index Language Ill. 3.a (Controlled terms. Broader Terms. Exhaustivity of Indexing 3 Search Rule A Document Relevance I - 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- [ £nation [ Level l i 1 2 3 4 5 6 7 8 0 Documents Retrieved Rel. Non-rel. 178 3,565 147 1,575 90 364 43 78 18 8 7 3 22 2 1 1 0 0 Recall Precision Fallout Ratio Ratio Ratio a/a+c a]a+b b/b+d 89.9% 4.7% 43.475% 74.2% 8.5% 19,Z03% 45.5% 19.8% 4.438% 21.7% 35.5% 0.951% 9.1% 69.2% 0.098% 3.7% 70.0% 0.037% 1.0% 50.0% 0.024% 0.5% 50.0% 0.012% 42 42 37 22 6 4 4 2 0 42 42 41 34 24 13 8 4 3 too FIGURE 4 a02P \. 40 80 70 80 90 I00 °to PRECISION INDEX LANGUAGE IIL 3. a (Index Language IIl. I. a Broken hne) 42 42 41 34 24 13 8 4 3