IRS13 Scientific Report No. IRS-13 Information Storage and Retrieval Evaluation Parameters chapter E. M. Keen Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. C 0 4, 0- 11-22 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.I I I 0 0.I 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 I.0 Recoil ADI, Abstracts, Thesaurus Individual Precision Recall Curves for 22 Requests, showing the Wide Scatter of Individual Results Fig . 12