ISR11 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. VI--Ti Relevant Correlation Document Normalized Normalized [OCRerr]Iuflction Strate[OCRerr] Iteration Ranks Recall precision Cosine Increasing 0 [OCRerr] .706 .512 Alpha 1 l,2,5,[OCRerr]2,52,67 *680 .613 2 l,2,[OCRerr]5,[OCRerr]7,5l,68 .669 .607 3 l,2,5,[OCRerr]9,5l,68 .665 .605 Constant 0 [OCRerr] .706 .512 Alpha 1 l,2,[OCRerr][OCRerr]7,5l,68 .669 .607 2 l,2,5,[OCRerr]7,5l,68 .669 .607 3 l,2,[OCRerr]5,[OCRerr]9,5l,68 .665 .605 Correlations 0 [OCRerr] .706 .512 1 l,[OCRerr],5,39,55,67 .677 .593 2 l,2,5,[OCRerr]7,48,70 .671 .609 3 Il,2,1,[OCRerr]5,[OCRerr]9,71 .667 .592 Co-occurrence Increasing 0 2,[OCRerr],25,30,[OCRerr]8,65 .662 [OCRerr] Alpha 1 [OCRerr] .6[OCRerr] .533 2 [OCRerr] .675 .570 3 Il,[OCRerr],L2,3[OCRerr],[OCRerr]9,73 .673 .557 Constant C 2,7,25,30,[OCRerr]8,65 .662 .455 Alpha 1 l,[OCRerr]8,45,Z+7,76 .650 .528 2 l,[OCRerr]3,[OCRerr],36,49,74 .675 .574 3 l,3,l0,35,5l,7if .669 .562 Correlations 0 2,7,25,30,48,65 .662 .455 1 l,[OCRerr],26,39,57,60 .643 .513 2 1,2,16,43,57,70 .636 .546 3 1,5,9,43,50,75 .649 .531 Simple Increasing 0 2,8,9,11,46,72 .725 .548 Vector Alpha 1 [OCRerr] 32,77 .762 .646 [OCRerr]tching 2 [OCRerr] .768 .682 3 [OCRerr] .773 .706 Constant 0 2,8,2,11,46,72 .725 .548 Alpha 1 l,[OCRerr],4,dl, 30,77 .768 .684 2 l,[OCRerr][OCRerr]IW,28,78 .768 .683 3 l,2,[OCRerr][OCRerr],27,78 .773 .706 Correlations 0 2,8,9,11,46,72 .725 .548 1 [OCRerr] .751 .647 2 1,2,7,24,65,80 .658 .604 3 l,2,[OCRerr],25,65,79 .656 .600 Query QAiSCOST The Result of the [OCRerr]`1ery Modification by Use of Relevance Infoz[OCRerr]riation as a [OCRerr]unction of the Nuniber of Relevant Doc[OCRerr]unents Initia13[OCRerr]r in the Fifteen iii[OCRerr]est Correlated Documents Figure 14