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. - 147 - 100- 90-- % ]:t E C A L L 1, 0.00! ,0.01 0.1 % FA'LLOUT 1.0 10 i00' FIGURE 4.614P t:{ECALL-FALI.OUT PLOT SHOWING EFFECT OF CHANGES 1N I{EI,EVANCE ON 50 QUESTIONS. WITH 1400 DOCUMENT COLLECTION, INDEX LANGUAGE 1.1.a