IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
Document Length
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.
V-[OCRerr]3
AVERAGE TOTAL TOTAL
DOCUMENT RELEVM[OCRerr] DOCUME[OCRerr][OCRerr][OCRerr][OCRerr] AVERAGE[OCRerr]
COLLECTION INPUT AND DICTIONARY LENGTH, (ALL RE WITH ZERO [OCRerr]CALL
re CONCEPTS CORRELATION CEILING
PER DOCT. QUESTS) WITH REQUEST
CRAN-l Abstract, Stem 61 198 17 .91
142 Indexing, Stem 32 198 11 .91+
Requests Abstract, Thesaurus-2 14o 198 1+ .98
Indexing, Thesaurus-2 30 198 0 1.00
*Computed usLng aggregate recall ("micro" evaluation).
Average recall ceiling figures comparing abstracts
and indexing on two dictionaries, Cran-l Collection.
Figure 29.