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.
SPECIFIC REQUESTS GENERAL REQUESTS
COLLECTION AND I I
DICTIONARY Average Rank Number of Average Rank Number of
of Last Relevant Requests of Last Relevant Requests
____________________ I I
[OCRerr]-. I I
RE-i, Abstract, Thesaurus-2 18.9 9 96.9 8
I I
RE-3, Abstract, Thesaurus-3 210.0 17 293.5 17
I I
RAN-i, Abstract, Thesaurus-3 1+5.2 21 85.8 21
DI, Abstract, Thesaurus-i 22.1 17 1+6.1 18
I `
omparison of Specific and General Requests using the Average Rank Position of the Last Rele-
vant Document to represent High Recall Need, (Thesaurus Dictionary)
Fig. 19