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-68 Results for Query No. 12 QAI2JOURNAL Document Rank Ijo. Name Relevant Correlation 1 4 3O7ROLE OF!' X .99758179 2 4o 1102C[OCRerr]TTRALI .33804448 3 19 30[OCRerr]EC0RDL[OCRerr] .30263667 4 46 1O9STATUS RF .24496349 5 33 11017I[OCRerr]TFOR[OCRerr].*[OCRerr] .23067222 6 17 30IDOCUIIE[OCRerr][OCRerr] .22284037 7 60 121[OCRerr]0WAI[OCRerr]D A .20152621 8 Si 110[OCRerr][OCRerr] AUTO .19281829 9 22 914THE RAPID .18659834 10 71 lOSSEARCHERS .17669065 11 63 214ELECTR0I[OCRerr] .15986243 12 32 [OCRerr] .15951821 13 35 1OO4DENSITY .15891377 i4 73 906[OCRerr]41CROFILI4 .15743547 15 37 3O6RROGRESS .15674261 Ranking took .150000 seconis Relevant Document Ranks Document Rank No. Name Relevant Correlation 1 4 3OTh0[OCRerr] OF," X .99758179 16 42 [OCRerr] PHOTO X .15338289 18 9 206MIALYSIS x .14746183 28 7 21IA COIIFUTE X .09539051 32 25 209T11E REDUC X .08745493 Norrna1ize[OCRerr] Recall = .7948718 Normalized Precision = .5518355 Rank R;call = .1579 LOb[OCRerr] Precision = .3842 N Query(3) = Querv(2) + Alpha [OCRerr] [OCRerr][OCRerr]IGHT(I) 1Z1 (1) * Document of Rank I Document Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Weight 10O00000000000O N = Number of retrieved documents Alpha = 2 (g) Results after Second Up[OCRerr]ate (Constant Alpha Strategy) Figure 12 (continued)