CRANV2 Simulated ranking and document output cut-off 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. - 218 - tO0 95 90 8S 80 75 70 65 60 "-J 55 -.I <~ U SO W n" [OCRerr] 45 40 35 3O 25 20 15 IO 5 T \ \ [OCRerr]<\ I \ o\ \ 5 IO t5 20 25 30 35 40 45 SO 55 60 65 70 75 80 85 90 95 IOO i °/o PRECISION FIGURE 5.23P COMPARISON OF PERFORMANCE, BASED ON DOCUMENT OUTPUT CUT-OFF, FOR EXHAUSTIVITY LEVEL 1 (Fig. 5.22T) AND EXHAUSTIVITY LEVEL 3 (Fig. 53T). e Exhaustivity Level 1 x Exhaustivity Level 3