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. - 111 - [OCRerr]='[OCRerr]G[OCRerr]JRE 4. 300T Index Language I. la (S. T. Natural language. Coordination) E[OCRerr]A[OCRerr]austivity of lnde[OCRerr]J_ng 3 Search Rule B Document Relevance 1 - 4 Number of Documents in Collection 1,400 Number of Questions 19 (Subset 4) Number of Relevant Documents 131 GeneraLity Number 4.9 i Coord- Documents RecaLl Precision Fallout ination Retrieved Batio Level Ratio Rel. Non-rel. a/a+c ala+b Ratio x y z blb+d 1 113 ioo (-) 88.3% (-) (-) 2 (-) 19 0 (-) 19 (-) 3 76.3% 68 828" 51.9% 19 0 7.6%* 19 3.105=[OCRerr]` 19 7* 19 4 37 127 28.2% 5 16 22.6% o. 480% 15 9 19 19 6 12.2% 11 64.0% 0 0. 034% 8.4% 6 19 19 100.0% 0.000% 3 19 19 7 4 0 8 3.1% 100.0% O. 000[OCRerr] 2 19 19 9 l0 11 12 13 14 15 FIGURE 4. 301T Index Language I. la (S. T. Natural language. Coordination) Exhaustlvity of indexing 3 Search Rule B Document Relevance 1 - 4 Number of Documents in Collection 1.400 Number of Questions 17 (Subset 5) Number of Relevant Documents 109 Generality Number 4.6 Coord- Documents Recall tnation Preclslon Fallout Retrieved Ratio Ratio Level Ratio Rel. Non-rel. aJa+c a/a+b " x y bJb+d z I io8 2 lOl i-) 99.1% (-) (-) (-) 17 0 17 3 92.7% (-) (-) 88 (-) 8o. 7% (-) 17 (-) O 17 17 0 17 4 66 1301 90.5% 5.489 51 4.8% 456 17 17 17 37 46.7% 178 10.0[OCRerr] 1.925% 33.9% 17.2% 17 17 0.751% 17 15 17 17 21 75 19.2% i0 21.9% O. 317% 0 9.2% 12 17 17 5 i00,0% 0 0.000% 4.6% 100.0% 7 17 17 0.000% 4 17 17 I0 0 0 11 O 0 0 17 17 12 O 17 17 13 14 15