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. LIST OF FIGU[OCRerr]S (continue[OCRerr]) Fi~e 3.14 Retrieval Performance as a Function Fee[OCRerr]back for Query TII[OCRerr]R In[OCRerr]exing?! 3.15 Retrieval Performance as a Function of Amount of of Amount of [OCRerr]a[OCRerr]e 3-43 Fee[OCRerr]ack for Query ?1H9 Natlangi? 3-44 3.16 Document - Document Correlation Matricies 3-45 3.17 Retrieval Results for Two Queries Pro[OCRerr]uce[OCRerr] from Original Search Re[OCRerr]uest "M9 Natlang1' * . . 3-46 4.1 Set Image Matching Operations * . 4-4 .4.2 Retrieval Operations with Bqolean Query Images 4-6 4.3 Total Number of Comparisions Require[OCRerr] vs. the Number of Categories 4-22 4.4 Flowchart of Region Density Test 4-25 4.5 Graphical Illustration of the Density Test 4-26 4.6 Program for Specifying Cutoff Correlation 4-27 4.7 Progression of Categories an[OCRerr] Correlation Distributions. 4.8 Classification Vectors.......................... 4.9 Flowchart of the Classification Algorithm 4.10 Cumulative Fre[OCRerr]uency Distribution of the Cutoff Correlation for Thre[OCRerr] Classifications . . 4.11 Query-Classification Vector Correlation Distribution for Request 11Core Memory11 4.12. Evaluation of Two Level Searching for Test Query `1Core[OCRerr]Me[OCRerr]ory" 4.13... Average [OCRerr][OCRerr]aluations for 24 Search Requests . 5.1 Characterization of Retrieval' Results xii 4-30 4-31 4-35 4-39 4-40 4-43 4-44 5-4