CRANV2 Aslib Cranfield Research Project: Factors Determining the Performance of Indexing Systems: Volume 2 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. - 235 - i00-- H E C A L L P R E C I S I O N R A T I O I O 8O 6O 40-.~ 20-- h d, 2 0 20 - 40 60- < [OCRerr]a lg 3 5 4 aj [e 7 '1 I 91 i ( I i l J i -- J k,, , r 12 3 a 3 FIGURE 6.16T RECALL AND PRECISION RATIOS WITH 200 DOCUMENTS AND 42 QUESTIONS AT COORDINATION LEVEL OF 2 FOR SIMPLE CONCEPT AND CONTROLLED TERM INDEX LANGUAGES;. AND [OCRerr].T COORDINATION LEVEL OF 3 FOR SINGLE TERM INDEX LANGUAGES.