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.
Thesaurus
Cosine Correlation
I.0' Increasing Alpha Strategy
m[OCRerr]I XD[OCRerr] Cut-off after retrieval
of m consecutive non-
.9. ½ D m:2 relevant documents
Updated 1st
.8'
.7. Searches 2nd
.6'
3rd [OCRerr]3>\rn:4m35
Precision .5.
X\m:4 O[OCRerr]
4
Initial Xm-5 \\
.3, Search[OCRerr] .m:5 \ 0Om[OCRerr]7
KfnC7\ I
Xm5IO1[OCRerr]
.2'
m>5XODm315
.1 muI5[OCRerr][OCRerr]. [OCRerr][OCRerr]O[OCRerr]Dm:20
m[OCRerr]20 mu20
0
.1 .2 .3
A .5 .6 .7 .8
Recall
Precision versus Recall for Initial Search and Updated Searches
Using Relevance Feedback (averaged over 22 search requests)
Table B12.