CRANV2 Methods for presentation of 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. - 70 - Recall Recall Precision Levels Ratio Ratio 100% 94. 4% 0. 9% 95% 93.7% i. 1% 90% 93. 5% 1.2% 85% 82.3% 2, 5,% 30% 8L 4% 2, 7% 75% 77.9% 3.1% 70% 67.8% 4.2% 65% 62.2% 5. 2% 60% 61.7% 5. 4[OCRerr]o 55% 54.0% 7. 2% 50% 52. 3% 7. 4% 45% 47.4% 8. 2% 40% 42.6% 10. 2% 35% 27.6% 15. 4% 30% 27. 5% 15. 3% 25% 22. 1% 17. 7% 20% 22.1% 17. 7% 15% 16.9% 22. 2% 10% 16.9% 22. 2% 5% 16.9% 22. 2% 0% 16.9% 22. 2% IOO 8o 7o 30 IO O. ,o 20 ao 40 so 60 7o 8o [OCRerr]o ,oo °/, PRECISION" FIGURE 3.31TP TABLE AND PLOT FOR RESULTS BY METHOD 5, RECALL LEVEL OF RETRIEVING TERM GROUPS, FOR INDEX LANGUAGE Ll.a (INDEX LANGUAGE L6. a DOTTED LINE)