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[OCRerr][OCRerr]3 R&nks of the Progression Correlation Relevant Documents Normalized Normalized of Alpha Function Iteration Appearing in the Recall Precision _______________ ____________ Top Fifteen [OCRerr]/l5,[OCRerr]/l5,[OCRerr]/l5 Cosine 0 3,1+,14 .706 .51[OCRerr] 1 1,3,5 .697 .603 2 1,2,5 .682 .616 _______________ ____________ 3 1,2,5 .677 .613 1,2,3 Cosine 0 3,[OCRerr],l4 .706 .5l[OCRerr] 1 1,2,5 .675 .612 2 1,2,5 .666 .608 _______ _______ _______ 3 __ 1,2,5 ______ .660 .606 2,3,[OCRerr] Cosine 0 3,24,1[OCRerr] .706 .51)4 1 1,2,5 .667 .608 2 1,2,5 .662 .606 _______ ________ 3 __ ____ 1,2,5 .662 .606 2,3,)4 Co-occurrence 0 2,7 .662 .)457 1 1,6,9 .6)43 .522 2 1,3,9 .662 .56)4 _________ ______ ________ 3 1,3,12 .665 .555 2,3,[OCRerr] Simple 0 2,8,9,11 .725 .550 Vector 1 l,3,)4,1)4 .766 .682 [OCRerr]tching 2 [OCRerr] .7Th .705 - _______ - 3 - l,2,)4,15 .773 .705 3,[OCRerr],5 Cosine 0 3,[OCRerr],l)4 .706 .51[OCRerr] 1 1,2,5 .667 .608 2 1,2,5 .662 .606 ________________ ____________ 3 1,2,5 .662 .606 1/15,2/15,3/15 Cosine 0 3,)4,l)4 .706 .514 1 2,5,8 .701 .532 2 1,3,6 .703 .598 - ________ - 3 - 1,2,5 .686 .618 2/15,3/15,4/15 Cosine 0 3,4,14 .706 .si4 1 2,3,5 .708 .576 2 1,3,5 .686 .598 _______ ______ ________ 3 1,2,5 .682 .616 3/15,4/15,5/15 Cosine 0 3,4,14 .706 .si4 1 1,3,5 .708 .609 2 1,2,5 .686 .618 _______________ ____________ 3 1,2,5 .677 .613 3,2,1 Cosine 0 3,4,14 .706 .514 1 1,2,5 .667 .608 2 1,2,5 .662 .606 3 1,2,5 .660 .606 Figure 6 (continued)