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-55 Results for Query No. 9 [OCRerr]9A[OCRerr]IALYSIS Document Rank No. Name Relevant Correlation 1 39 51[OCRerr]ESEARCH .[OCRerr]330l270 2 [OCRerr]7 1116RETRIEVA .[OCRerr]2135O[OCRerr][OCRerr]9 3 11 l117PLANNING .[OCRerr]0209035 Ii 62 889A MECH[OCRerr] .39900373 5 12 ll13THE M[OCRerr]TE .3[OCRerr]8l553l 6 2 8lhA NE[OCRerr]'[OCRerr] EFF .3[OCRerr]2997l7 7 [OCRerr] 3O7ROLE OF/ .32[OCRerr]78[OCRerr][OCRerr]90 8 17 3OlDOCUMENT .32075015 9 9 206ANALYSIS .29329[OCRerr]23 10 23 815A FACET A . 29329[OCRerr]23 11 27 5041S RELEVA .28867513 12 21 l209SCIENCE .2872[OCRerr]249 13 1 l10[OCRerr] THE [OCRerr]M . 28[OCRerr]73l6 l[OCRerr] 71 108s[OCRerr]ARCHERs .28517591 15 70 6OlENCODING .28306926 Ranking took .150000 seconds Relevant Document Ranks I Document I I__Rank No.__[OCRerr] Name Relevant Correlation 1331821 308M1[OCRerr]CHINE R X .20701967 1LLffiI [OCRerr]l8ENCLIsH-L x .12038585 Normalized Recall = .5l23[OCRerr]57 Normalized Precision = .l7[OCRerr]2522 Rank Recall = .0366 Log Przcision = .0938 Query(1) = Query (0) + Alpha N [OCRerr][OCRerr]IG(RT1) (I) * Document of Rank I 1=1 Document Rank 1 2 3 [OCRerr] 5 6 7 8 9 10 11 12 13 l[OCRerr] 15 Weight -1-1 0 0 0 0 0 0 0 0 0 0 0 0 0 N = Number of retrieved documents Alpha = Correlations (g) Initial Results Use of Negative Weights Cosine Correlation Function Alpha = Correlations Strate[OCRerr] Figure 10 (continued)