ISR11
Scientific Report No. ISR-11 Information Storage and Retrieval
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-143
Relevant Document Normalized Normalized
Ranks Recall Precision
A. Ou,ery OA9ANALYSIS
Initial
Results 33,50 .506 .172
Results After
First Update 6,28 .506 [OCRerr]
Results After
Second Update 1,2 1.000 1.000
B. Query OBIIINDEX
Initial
Results 21 .756 .309
Results After
First Update 4'4 .[OCRerr]76 .141
Results After
Second Update 41 .512 .157
Results After
Third Update 22 .744 .299
C. Ouery QB8COSTRET
Initial
Results 16 .817 .371
Results After
First Update 65 .220 .053
Results After
Second Update 37 .561 181
Results After
Third Update 7 .927 .558
Cosine Correlation Function and Increasing
Alpha Strategy used for all Three Cases
Selected Results Showing Various Effects of the
Negative Weighting Heuristic Method
Figure 9