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. v'-26 First Second Third Merit Initial Update Update Update _______ Search INC. CON. CORR. INC. CON. CORR. INC. CON. CORR. 1 COg CO-OC CO-OC Cog CO-OC CO-OC Cog CO-OC CO-OC COS 2 CO-OC Cog Cog SVM COg Cog CO-OC COS COS CO-OC 3 S[OCRerr]4 SVM SVM CO-OC S[OCRerr]4 S[OCRerr]4 SVM SVM g[OCRerr]I g[OCRerr]4 INC = alpha increasing Cog = cosine function CON = alpha constant CO-OC co-occurrence function CORR = alpha correlations Sv'A = s[OCRerr]ple vector matching function Order of Merit assigned by No[OCRerr]nalized Overall for the Correlation Functions Table BlO First Second Third Merit Update U[OCRerr]date Update 1 CO-OC CON CO-OC CON CO-OC INC 2 CO-OC INC CO-OC INC CO-OC CON 3 COS CON COS INC COS INC 1 [OCRerr] CON COS CON COS CON 5 SV[OCRerr][OCRerr] INC SVM CON SVM CON 6 COS INC COS CORR COS CORR 7 SVM CORR SVM INC CO-OC COR[OCRerr] 8 COS CO?? CO-OC CO?? SVM INC 9 CO-OC COR? Sv'4 COR? SVM COR? INC = alpha increasing COS - cosine function CON = alpha constant CO-OC - co-occurrence function COR? = alpha correlations SVM - simple vector matching function Order of Merit assigned by Normalized Overall for Different Functions and Aiphas when the Increase in Performance of each Update Compared with the Initial Search is Considered Table Bll