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-56 Results i[OCRerr]or Query No. 9 QA9ANALYSTS Document Rank No. Name Relevant Correlation 1 [OCRerr] 307?OLE OF! .18272327 2 82 308MACHII[OCRerr] R X . o[OCRerr]92S6L.t 3 75 20IA SYSTEM .03933260 [OCRerr] 74 3O5T[OCRerr]IE USE 0 .03230139 S 46 lO9STATUS RE .02442883 6 23 81 A FACET A .01289122 7 25 209Ti[OCRerr] REDUC .01245912 8 4o ll0[OCRerr]ENTRAL[OCRerr] .00747294 9 3 12101N I[OCRerr][OCRerr]0R 0 10 10 120IACCREDIT 0 11 31 207PRACTICAL 0 12 37 3O6PROGRESS 0 13 4[OCRerr] 1215 GRADUA[OCRerr].' 0 14 48 804C0[OCRerr]RI 0 15 57 603C01IPILATI 0 Ranking took .166557 seconds [OCRerr]e1evant Document Ranks Document No. Name Relevant Correlation 2 82 308i[OCRerr]CHIi[OCRerr]IE R X . 084925[OCRerr]1, MifflO 4l8ENGLISH-L x - .02116537 Normalized Recall = .8456790 Norinalized Precision .5981638 Rank Recall = .1071 LOb[OCRerr] Precision = .1754 N ;[OCRerr][OCRerr]IGHT(I) Query(2) = Query(l) + Alpha [OCRerr] * Document of Rank I (1) 1=1 Document Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 i4 15 Weight 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 N = Number of retrieved documents Alpha = Correlations (h) After First Update Figure 10 (continued)