IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
Test Environment
chapter
E. M. Keen
Harvard University
Gerard Salton
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
Average Recall at Fallout Average Fallout Precision PrE
Rank of Given Versus Rank of at Given at Given VE
Last Document Recall Normalized Normalized First & Document Document RE
~n
Relevant Cut-off Curve, Recall Precision Second Cut-off Cut-off C[OCRerr]
(Fig. 17) (e.g. Fig Pseudo Relevant (e.g. Fig. (e.g. Fig. Ps
16) Cut-off (Fig. 18) 16) 16) Cu
S S S S S G G G
S S S G S G G G
S S S S S G G G
S S S S S G G G
S Specific Requests Perform best
G General Requests Perform best
All results are based on Abstracts with Stem Dictionary
Summary of Results of Nine Ways of Comparing Specific and General Requests
Fig. 15