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. ViA2 Ranks of the Progression Correlation Relevant Documents Normalized Normalized of Alpha Function Iteration Appearing in the Recall Precision Top Fifteen 1,1,1 Cosine 0 3,[OCRerr],15 .706 .51[OCRerr] 1 1,2,5 .675 .612 2 1,2,5 .667 .608 _______ _______ _______ 3 1,2,5 _______ .667 _ .608 1,1,1 Co-occurrence 0 2,7 .662 .[OCRerr]57 1 1,5,10 [OCRerr] .528 2 1,3,7 .673 .580 ______ _______ 3 1,3,10 .671 .565 1,1,1 Sin[OCRerr]1e 0 2,8,9,11 .725 .550 Vector 1 2,3,4,1[OCRerr] .760 .61[OCRerr]3 [OCRerr]tching 2 [OCRerr] .766 .682 ___________ __________ 3 [OCRerr] .768 .683 2,2,2 Cosine 0 [OCRerr] .706 .5i4 1 1,2,5 .667 .608 2 1,2,5 .665 .607 _______ _______ ___ 3 1,2,5 _______ .660 .605 3,3,3 Cosine 0 3,[OCRerr],14 .706 .5i4 1 1,2,5 .667 .608 2 1,2,5 .661 .605 _______ 3 - 1,2,5 ______ .662 .606 [OCRerr] Cosine 0 [OCRerr] .706 .5i[OCRerr] 1 1,2,5 .665 .608 2 1,2,5 .662 .606 ______________ ____________ 3 1,2,5 .662 .606 1/15,1/15,1/15 Cosine 0 .706 .5i[OCRerr] 1 2,5,8 .701 .532 2 2,5,7 .690 .530 3 2,3,7 _______ .5[OCRerr]9 2/15,2/15,2/15 Cosine 0 .706 .5i1+ 1 2,3,5 .708 .576 2 1,3,5 .699 .605 3 - 1,2,5 ______ .686 __ .618 3/15,3/15,3/15 Cosine 0 .706 .51[OCRerr] 1 1,3,5 .708 .609 2 1,2,5 .686 .618 3 1,2,5 .682 .615 [OCRerr]Al5C0ST Results of Various Progressions of Aiplia Figure 6