CRANV2 Supplementary tests and 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. - 229- FIGURE 6.8T Index Language 1.1. a Exhaustivity of Indexing 3 Search Rule A Document Relevance t-4 Number of Documents in Collection 1400 Number of Questions 42 Structures Questions Number of Relevant Documents 255 Generality Number 4.3 ICoord- Documents Recall i[OCRerr]ation R et rieved Precision Fallout Ratio Level Rel. Non-tel. Ratio a/a+c Ratio a[ a+b x y z b[ b+d 1 251 22629 98.4% 2 1,1% 216 38.652% 42 6081 84.70/° 42 42 3 172 1822 67. 590 3.4% 10. 387% 8.6% 42 42 42 3.112% 41 42 42 4 92 602 36.1% 5 43 182 13.39o 16.9% 1. 028% 34 41 41 6 23 19.1% 65 9.0% o.3110/o 23 26.1% 37 37 o.1110/o 15 30 30 7 12 21 4.7% 8 36.49° 2 0.036% 10 4 0.80/° 25 25 9 1 33.390 2 0.49° 0. 00790 2 33.39° 19 19 O. 003% 2 14 14 10 0 0 11 0 0 10 0 10 0 4 4 I0O 9o 80 7o 60 --I ...J < W[OCRerr]-I. SO 30 2O I0 x Fig. 6.8T o Fig. 4.120T \ -t \ ., \ff IO 20 30 40 SO 60 70 *1o PRECISION 80 90 I00