CRANV2 Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2 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. - 178 - Io0 95 90 85 80 75 70 65 60 _1 55 .-I < [OCRerr] so rr o 45 g- 40 35 30 25 20 is qO s 0 I \ \ \ \ \ r \ .... r -, " [OCRerr]J 5 I0 15 20 25 30 35 40 45 50 5S 60 65 70 75 80 85 90 95 I00 °1o PRECISION FIGURE 4,826P INDEX LANGUAGES III. l.a (X), IiI.2.a ([OCRerr]), III.3.a [OCRerr]:1), III.4.a ([OCRerr]), III.5.a (+), III.6.a (O), SEARCH E. 350 DOCUMENTS (Figures 4.820T - 4.825T)