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-~ Re[OCRerr]ults for [OCRerr]uer[OCRerr] No. 12 Q[OCRerr]l2J0URNAL Docun'ent Rank No. N[OCRerr]'ne Relevant Correlation 1 4 30[OCRerr]0LE OF/ x .88970072 2 9 206AIIALYSIS x .57284742 3 40 1l00[OCRerr]0[OCRerr]iW'iRALI .40983981 4 19 3O2RECORDING .27680043 5 46 1O9STATUS RE .27678442 6 33 11017II'F0R1[OCRerr]iA .27389171 7 60 l2l2TOWARD A .26646284 8 7 21IA C0IPLWi[OCRerr] X .25798837 9 75 [OCRerr] SYSTEM .24558033 10 17 30ID0CUI[OCRerr]i'TT .24107313 11 22 914TH[OCRerr] RAPID .23551009 12 81 ll07TI[OCRerr] AU20 .22878123 13 69 8i[OCRerr]u[OCRerr]oi[OCRerr][OCRerr]io .22320053 14 73 906I[OCRerr]CR0FILM .21701659 15 71 1O8SEARCNDRS .20838206 Ranking took .183333 seconds Relevant Document Ranks Document Rank No. Nane Relevant Correlation 1 4 30ThOLE OF! x .88970072 2 9 206AI[OCRerr]LYSIS x .57284742 8 7 21IA C0I[OCRerr]j[OCRerr]E X .25798837 1([OCRerr] 42 203:cIJ B[OCRerr]T0 X .20575649 24 25 209TH: RKDUC X .16819640 Normalized Recall = .9076923 Normalized Precision = .7701336 Rank Recall = .2941 Lo[OCRerr] Precision = .5488 N `[OCRerr]IGHT(I) (Query(3) = Query (2) + Alpha `[OCRerr] (1) * Document of Rank I 1=1 Document Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Neight 11o0ooo1000OO00 N = Number of retrieved documents Alpha = 3 (c) Results after Second U[OCRerr]date (Increasing Alpha Strategy) Figure 12 (continued)