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-~ Normalized Measures Search i[OCRerr]e Recall Precision Overall Initial Search 0.7552 0.55[OCRerr]5 1.3097 First Update 0.8129 0.7027 1.5156 Second Update 0.8377 0.7[OCRerr]93 1.5830 Third Update 0.8385 0.75SC' 1.5935 Average Search Results for Co-Occurrence Function and Increasing Alpha Table B1[OCRerr] I[OCRerr]rmalized Measures Search [OCRerr] Recall Precision Overall Initial Search 0.7552 o.55245 1.3097 First UDdate 0.8177 0.7098 1.5275 Second Update 0.8390 0.7L,'90 1.5880 Third Update 0.8386 0.75l[OCRerr] 1.5900 Average Search Results for Co-Occurrence Function and Constant Alpha Table 35 Normalized [OCRerr]4easures Search T[OCRerr]e Recall Precision Overall Initial Search 0.7552 o.55IL,5 1.3097 First Update 0.7899 0.6590 l.[OCRerr][OCRerr]89 Second Update 0.80l[OCRerr] 0.6898 1.[OCRerr]9l2 Third Update 0.8l[OCRerr] 0.70[OCRerr]8 1.5172 Average Search Results for Co-Occurrence and Alpha Correlations Table 36 [OCRerr]ction