ISR10 List of Figures list of figures Joseph John Rocchio Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. LIS[OCRerr] OF F-IGUI[OCRerr]ES Fi[OCRerr][OCRerr][OCRerr]re [OCRerr]a[OCRerr]e 2.1 Excerpt from the [OCRerr] Thesaurus . 2-7 2.2 Alternative Property Space Index Representations * 2-11 3.1 Query Formulation - The User-System Interfaces * 3-2 3.2 Geometrical Representation 0£ Relevance Feedback * 3-14 3.3 Relevant Document Images (r1 and r2) Which Rave OrJy Slight Association 3-19 3.4 Rypothetical Document-Document Correlations Among an Assumed Set 0£ Relevant Documents * 3-19 3.5 A Typical Sample Search Request 3-26 3.6 Query Processing Using Relevance Feedback for Search Request liI[OCRerr]R Ihdexing11 3-29 3.7 Correlation Distributions for SearchRequest "I-R Indexing1[OCRerr][OCRerr] 3-31 3.8 Query Processing Using Relevance Feedback for Search Request 11Pattern Recognition11 3-33 3.9 Query Processing Using Relevance -Feedback for Search Request 11Analog-Digital11 3-34 3.10 Precision vs. Recall for Initial Queries and [OCRerr]ueries Modified by Relevance Feedback (Averaged Over 24 Search Requests) 3-36 3.11 Comparison of Retrieval Results Using Original and Modified Query for Search Request 11Random [OCRerr]umbers11 3-37 3.12 frecision vs. Recall for Ini*tial Queries and-Iwo Iterations of Relevance Feedback.................... 3-40 3.13 Retrieval Ranks of Relevant Documents for Query * l1Automata11 Comparing Original Results with Those Obtained on Succesaive Iterations . *. . - 3-41 xi