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-23 i[OCRerr]orma1ized Measures Search [OCRerr] Recall Pr[OCRerr]cision Overall Initial Search 0.7601 0.5566 1.3167 First Update o.8083 0.6967 1.5050 Second Update 0.823i.l. o.y[OCRerr]8i 1.5715 Third Uodate 0.8267 0.755[OCRerr] 1.5821 Average Search Results for Cosine Function a[OCRerr]d Increasing Alpha Table 31 .orrnalized 1[OCRerr]Ieasures Search [OCRerr]rpe Recall Precision Overall Initial Search 0.7601 0.5566 1.3167 First U[OCRerr]date o.81o0 0.6987 1.5087 Second Update 0.819?; 0.7381 l.557[OCRerr][OCRerr] [OCRerr]hird Update O.8iD[OCRerr][OCRerr] 0.7[OCRerr]0l 1.5590 Avcrage Search Results :or Cosine Function and Constant Alpha Tabic 32 \IO[OCRerr]lized Measures Search Tye Recall Precision Overall Initial Search 0.7601 o.5566 1.3167 First Update 0.8038 0.6873 1.[OCRerr]9ll Secon(i Update 0.u0119 0.7138 1.5257 Third Update 0.8150 0.7153 1.5303 Average Search Results for Cosine Function and Alpha Correlations. Table B3