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. Results for Oue[OCRerr]r No. 12 QAl2JOURI[OCRerr]AL Document Rank No. Name Relevant Correlation 1 [OCRerr] 3OThOLE OF/ x .97316392 2 [OCRerr]0 ll02CEI[OCRerr]RALI .36664099 3 19 3O2RECORDING .31881481 4 46 l09STATUS RE .27034708 5 6Q 1212TOWARD A .22240874 6 17 3OlDOaUMENT .21357210 7 81 ll0[OCRerr]HE AUTO .20593402 8 33 ll0l7INFORM[OCRerr][OCRerr] .20490176 9 22 914THE RAPID .18534062 10 35 lO04DENSITY .16972328 11 71 lO8SEARCHERS .16782759 12 32 902DOCUI[OCRerr][OCRerr][OCRerr] .16250565 13 9 206ANALYSIS x .15534474 14 74 3O5THE USE 0 .15291796 15 69 8l[OCRerr]UTO[OCRerr][OCRerr][OCRerr]IC .14994794 Ranking took .150000 seconds Relevant Document Ranks Document Rank No. Name Relevant Correlation *l 4 30[OCRerr]0LE o[OCRerr]/ x .97316392 13 9 206M[OCRerr]ALYsIs x .15534474 18 42 203I[OCRerr][OCRerr] PH0[OCRerr]0 X .14219245 27 7 21IA Co[OCRerr][OCRerr]R X .11279471 32 25 209THE REDUC X .09651717 Normalized Recall = .8051282 Normalized Precision = .5660867 Rank Recall = .1648 Log Precision = .3919 N [OCRerr][OCRerr]IGHT(I) * Document of Rank I [OCRerr]uery(2) = Quer[OCRerr](l) + Alpha [OCRerr] (1) 1=1 Document Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 i4 15 Weight l00000000000100 N = Number of retrieved documents Alpha = 2 (b) Results after First Update (Increasing Alpha Strategy) Figure 12 (continued) vi-63