ISR11 Scientific Report No. ISR-11 Information Storage and Retrieval Relevance Feedback in an Information Retrieval System chapter W. Riddle T. Horwitz R. Dietz Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. Figure 10 VI-29 II[OCRerr]IX' OF FIGURES (continued) Use of Negative Weights Page VI[OCRerr]9 Figure 11 Figure 12 Figure 13 Continued Use of Negative Weights when Use in the First Update Fails to Move Query into Correct Region of N-Space Comparison of Results After Three Iterations as a Function of the Value of Alpha used in First Update Cosine Correlation Function Effect of the Initial Value of [OCRerr] used in the Iteration [OCRerr]ocess VI- 58 VI-62 VI-70 Figure l[OCRerr] The Result of the Query Modification by Use of Relevance 1nfo[OCRerr]nation as a Function of the Number of Relevant Documents Initially in the Fifteen Highest Correlated Documents VI-71