ISR10
Scientific Report No. ISR-10 Information Storage and Retrieval
Search Request Formulation
chapter
Joseph John Rocchio
Harvard University
Gerard Salton
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
L
*
0rigi[OCRerr]al Modified Queries
Query N=1 N:=2 N-3 N-6
4 1 1 1 1
Ranks 7, 2 2 2 2
of 13 3 4 3 3
Relevant 15 4 5 5 6
Documents 17 5 6 6 7
23 31 25 8 8
Average [OCRerr]orr.
of All (6) 425 .354 .45[OCRerr] .461
Relevant Docs.
Average Gorr.
of 1st 6 Non- .3[OCRerr]6 .321 .258 .312 .310
relevant Docs.
Difference -.108 .104 .096 .147
*(N relevant and N nonrelevant documents used for relevance feedback.)
.288
.151
Retrieval Performance as a Function of Amount of Feedback for Query 111-R Indexing1'
Figure 3.14