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-32
TOTAL DOCUMENTS AVERAGE*
TOTAL WITH ZERO RECALL
COLLECTION INPUT AND DICTIONARY [OCRerr]LEVANT CORRELATION CEILING
ALL REQUESTS WITH REQUEST
Abstract Stem 170 15 e91
ADI Text Stem 170 0 1.00
35
Abstract Thesaurus-i 170 l[OCRerr] .92
Requests Text Thesaurus-i 170 1[OCRerr] .99[OCRerr]
*
Computed using the aggr[OCRerr]gate recall ("micro'1 evaluation).
The one document having zero correlation with the thesaurus does c[OCRerr]rrelate
with r[OCRerr]quest concepts "terhniquet1 and "[OCRerr]ystem" in the stem dictionary,
but these terms are in the conmion words list for the thesaurus [OCRerr]ictionar[OCRerr].
Average r[OCRerr].call ceiling figures comparing abstract
and' full text searches on two dictionaries.
Figure 20.