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-[OCRerr]5 RanI[OCRerr]s of Relevant Normalized Normalized Rank Log Documents Recall Precision Recall Precision Initial 3 11l7I[OCRerr]AJ[OCRerr]NIITG .706 .512 .l3[OCRerr] .1[OCRerr]7 Results [OCRerr] 3O6FROGRESS il[OCRerr] lll0C0I[OCRerr]FUT[OCRerr][OCRerr]R 19 1106A NET CE [OCRerr]9 90[OCRerr]0CUI[OCRerr]JT 68 716A I[OCRerr]ATI0NA Results After 1 lll7FLAITI[OCRerr]ITG .670 .613 .l[OCRerr] [OCRerr] First Updatc 2 lil0C0I[OCRerr]R 5 3O6RROGRESS [OCRerr]2 1106A iii[OCRerr]q C: 52 716A IATT10I[OCRerr] 67 90[OCRerr]0CULi[OCRerr][OCRerr] Results After 1 l3l7PL£'[OCRerr]ThIING .669 .607 .121 [OCRerr] Second U[OCRerr]CLate 2 l110C0[OCRerr]IPUTER 5 306[OCRerr]0GRESS [OCRerr]7 1106A i[OCRerr]T CE 51 716A TT[OCRerr]TIQT...TA 68 90[OCRerr]0CUi'[OCRerr]iTT Results Aft[OCRerr]r 1 lll7PLAi[OCRerr]TII[OCRerr] .665 .605 .119 .459 [OCRerr]ird U[OCRerr]date 2 ll10C0i.[OCRerr]r[OCRerr]R 5 3O6FROGRESS [OCRerr]9 1106A NET CE 51 716A I[OCRerr]TI0NA 68 902DOGU[OCRerr].EITT Query [OCRerr]A15C0ST Cosine Correlation Function Increasing Alpha Strategy Typical Results of Query [OCRerr]dification Using Relevance Feedback Information in Case when the Relevant Documents Split into [OCRerr]TO Regions in N-Space Figure 7