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. - 124 - FIGURE 4.404T Index Language I. 1. a (S. T. Natural language. Coordination) Exhauativ[OCRerr]ty of Indexing 2 Search Rule A Documem 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 Coord- Documents HecaLl Precision FaLlout ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-tel. a/a+e ala+b b/b+d I 186 3,401 93.9% 5.2% 40.488% 42 42 42 2 157 1,605 79.3% 8.9% 10.566% 42 42 42 3 120 582 60.6% 17.1% "/.096% 40 42 42 4 81 164 40.9% 33.1% 2. 000% 32 41 41 5 39 46 19.7% 45.9% 0.561% 20 39 39 6 22 10 tl.l% 68.8% 0.122% 12 33 33 7 1O I 5.1% 90.9% 0.O12% 3 27 27 8 3 0 1.5% too. o% o. 000% 2 16 ii 18 9 0 0 0 II I0 ii 0 0 0 7 7 0 0 0 3 3 12 0 0 0 I 1 13 14 15 FIGURE 4.405T Index Language I.l.a (S.T. Natural language. Coordination) Ex.haustivity of Indexing 1 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 23.8 Coord- Documents Recall Precision Fallout Ination Retrieved Ratio Ratio Ratio x y g Level Rel. Non-tel. ala+c a/a+b b/b.+d I 175 2.426 88.4% 6.7% 28.880% 42 42 42 2 132 942 68.7% 12.3% 11.495% 42 42 42 3 96 240 48.5% 29.0% 2.926% 35 42 42 4 50 63 25.3% 44.2% 0.768% 25 41 41 5 24 17 12.i% 58.5% 0.207% 13 39 39 6 15 2 7.6% 86.2% 0.024% 6 33 33 7 6 0 3.0% lOO. O% 27 27 IOO.O% 0.000% 3 8 1 C 0.5% 0.000% I 18 ii 18 9 0 0 0 II I0 0 ii 0 0 7 7 0 0 0 3 3 12 0 O O I I 13 14 15