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-25 Norma[OCRerr]i-ed [OCRerr].easures Search *Thi[OCRerr]e Recal[OCRerr]' Precision Overall Initial Search 0.7[OCRerr]87 0.5356 l.23[OCRerr]i3 First U[OCRerr]date 0.7958 0.6789 l.[OCRerr]7[OCRerr]7 Second TJpdate 0.79[OCRerr] 0.6864 l.[OCRerr]858 Third Uo date 0.8Q01 0.6885 1.24886 Average Search Results for SLmple Vector Matching Function and Increasing Alpha Table [OCRerr]7 ormalized Measures Search ThrDie Recall Precision Overall Initial Search 0.72487 0.5356 1.28243 First UL[OCRerr]date 0.7968 0.6782 1.24750 Second Update 0.8029 0.6966 1.24995 Third Update 0.8033 0.69[OCRerr] 1.5m.7 Average Search Results for Simple Vector Matching Function and C:'.nstant Alpha Table B8 Normalized Measures Search [OCRerr]e Recall Precision Overall Initial Search 0.72487 0.5356 1.28243 First Update 0.792424 0.6712 1.24656 Second Update 0.7753 0.6566 1.24319 Third Update 0.772424 0.65247 1.24291 Average Search Results for Simple Vector Matching Function and Alpha Correlations Table B9