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. - 102 - }' i[OCRerr],UR E 4. 201T [OCRerr]-,dex Language 1.3a (S.T. Word forms. Coordination) Exhaustivity of Indexing 3 Search Rule A Document Relevance i - 4 Number of Documents in Collection 200 (Subset I ) Number of Questions 42 (Subset 2) Number of Relevant Documents 198 Generality Number 23,6 Coord- Documents Recall ination Retrieved { Precision " Fallout Ratio Level I[OCRerr]el. Non-tel. ]Ratio a]a+C Ratio a/a+b y z b/b+d 1 191 4,416 96.5% I x 2 166 4.1% 2,221 83.8% 53.826% 42 42 42 3 139 7.0% 913 70.2°/c 27.079% 42 13.2% 42 11.131% 42 42 42 42 4 97 315 5 49.0% 59 23.5% 102 29.8% 3. 841% 35 41 41 6 32 36.6% 28 1.244% ! 16.2% 25 53.3% 39 39 0.341% 17 33 33 7 14 3 8 7.1% 4 32.4% 1 0.037% 8 27 27 9 2.0% 0 80.0% I 0.012% 0.0% 2 0.0% 18 0. 012% 18 1 II 11 10 0 0 11 0 0 0 7 7 12 0 0 , 0 3 3 0 1 1 13 14 15 IOO 80 70 60 J .J' o so c£ 4o 3o 20 Io o io -\ \ J f 40 50 50 °/[OCRerr] PP, ECI SION XO 70 8o ioo