CRANV2 Test Environment 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. - 27 Index Language L 2. a (S. T. Synonyms. Coordination) Exhaustivity of Indexing 3 Search Rule A Document Relevance 1 - 4 Number of Documents in Collection Number of Questions 221 (Subset 3) Number of Relevant Documents Generality Number 5.1 1.400 1,590 {( C oord- Documents Recall Precision Fallout ination Retrieved Ratio Ratio Ratio x y z Level Rel. Non-rel. a]a+c a/a+b b/b+d 1 1.514 (-) 95.2% (-) 221 0 221 2.2%* (-) 2 1,313 59,734. 82.6% 19. 406"/0* 221 44* 221 3 981 23,654* 61.7% 4. 0%* 7.680%* 216 109" 220 4 644 8, 850* 40.5% 6. 8%* 2. 873%* 192 142" 212 5 355 2, 946* 22.3% 10.4%* 0.957%* 139 177* 197 6 169 928* 10.6% 15.4%* 0. 301%* 92 161" 164 7 80 254 5.0% 24.0% 0. 083% 55 140 140 8 24 59 1. 570 28.9% O. 019% 23 105 105 9 8 8 o. 5% 50.0% o. 003% 8 78 78 I0 1 52 52 ii 1 0 o.i7o loo.o% 0.000% 0 0 0 32 32 12 0 0 0 15 15 13 0 0 0 8 8 14 0 0 0 4 4 15 0 0 0 3 3 FIGUI:tE 2.14 SAMPLE TABLE OF TEST RESULTS