IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
An Analysis of the Documentation Requests
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.
xJ+o
Precision
0.6 -
0.5 -
0.4
0.3 -
0.2 -
0.1 -
Word Stem Dictionary
Thesaurus Dictionary
Result of Stem for 10
Requests, and Thesaurus
for 25 Requests, Simula-
ting Perfect Pre-search
Choice
I Recall
0.8 1.0
y
I I I
0 0.2 0.4 0.6
ADI Abstracts, "Pseudo-Cranfield" Cut-off, Macro Evaluation
of 35 Requests.
C[OCRerr]parison of Perfect Pre-search Choice of Two
Dictionaries with each Dictionary Used Exclusively.
Fig. 23.