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. - 187 - FIGURE 4.900T Index Language IV. 1. a Exhaustivity of Indexing Tit!e only Search Rule A Document Relevance i - 4 Number of Documents in Collection Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 (Single terms. Natural language. Coordination) 200 Coord- Documents ination Retrieved I Rel. Non-re1. x y z 155 1,902 I Recall Precision Ratio Fallout Level a/a+c Ratio a/a+b Ratio b]b+d 1 2 78.3% 7.5% 23.169% 42 o 42 3 108 463 58 54.5% 76 18.9% 29.3% 5.045% 43.3% 40 42 42 4 0. 927% 32 42 42 5 26 15 13.1% 7.6% 63.4% 0.183% 16 41 41 6 15 3 6 0 83.3% 3.0% lOO. 0% 0. 037% 9 39 39 7 o. 000% 3 33 33 8 3 O 0 1.5% 1 oo. 0% o. 000% 1 o 27 27 9 O 0 0 o 18 18 lO 0 I1 11 11 0 0 o o 7 7 12 0 0 0 o 3 3 1 1 FIGURE 4.901T Index Language iV. 2.a (Single terms. Exhaustivity of Indexing Title only Search Rule A Document Relevance 1 - 4 Number of Documents in CoLlection 200 Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23.6 Word forms. Coordination) Coord- Documents ination Recall Retrieved Precision Fallout Level Rel. Non-rel. Ratio a/a+c Ratio a/a+b Ratio b]bed x y z 1 159 2,0t7 2 111 80.3% 512 7.3% 24. 592% 42 0 42 3 65 56.1% 94 17.8% 32.8% 6.242% 40.9% 40 1.146% 42 42 34 42 42 4 29 18 5 17 14.6% 61.7% 8.6% 0.210% 16 41 41 6 4 7 0 81.0% 3.5% 0. 049% 100.0% 12 0. 000% 39 39 3 33 33 7 3 0 8 0 1.5% I00.0% 0 0. 000% 1 o 27 27 9 0 0 18 18 0 11 11 1o 0 0 II 0 0 0 7 7 12 0 0 0 3 3 0 1 1