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- 60 Results for Query No. 28 [OCRerr]llINDEX Document Rank I'[OCRerr]. Name Relevant Correlation 1 50 li.18ENGLISH[OCRerr]L - .00576985 2 77 213ADAPTIVB -.00889623 3 5[OCRerr] 90IA SELECTE - .0104587[OCRerr] [OCRerr] 29 212A STA[OCRerr]IST - . 02[OCRerr]26927 5 35 10OL[OCRerr]DENSITY - .02687667 6 31 207PRACTICAL - .03[OCRerr]l58l0 7 18 ll225TA[OCRerr]-0F - .03968813 8 82 308M[OCRerr]CHINE R - .03968813 9 2 8ThA NEW EFF -.04383773 10 38 303C. M. HER - .04518692 11 74 305THE USE 0 -.04843090 12 11 1117PLAN[OCRerr]iNG - .05139033 13 32 90[OCRerr]0CUMENT - .05146744 14 14 518EDUCATION - .05200079 15 64 SO7PARAGRAPH - .05325330 Ranking took .150667 seconds Relevant Document Ranks [OCRerr] Document [OCRerr] No. Name Relevant Correlation LLLI__111C0[OCRerr]4FuTER x - .17773708 Normalized Recall = .5121951 Normalized Precision = .1572932 Rank Recall = .o24[OCRerr] Log Precision = 0 N T,[OCRerr]IG Query(3) = Query(2) + Alpha [OCRerr] H+I)* Document of Rank I 1=1 Document Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Weight -l -l 0 0 0 0 0 0 0 0 0 0 0 0 0 N = Number of retrieved documents Alpha = 3 Update plus matching took 10.650000 seconds (c) Results after Second Update (Increasing Alpha Strategy) Figure 11 (continued)