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.
o Suffix `5' Dictionary
[OCRerr] Stem Dictionary
* Thesaurus Dictionaries
o Other Dictionaries used in Cranfield Project
1.0
0.9 -
IRE-31 Abstracts
____________________ A
p
- Crun-11 Abstracts
0.8 -
ex ADI1Text [OCRerr] 0
C,
[OCRerr] 0.7
N
a
- *- Cranfield Project*,
0 * - - - - [OCRerr] Indexing1 1400
Z 0.6
[OCRerr][OCRerr]Documents.
0.5 -
0
0
I liii II iii I I I I I II
0A0
1000 2000 3000 4 5 6 7 8 910PO0
Total Concepts in Dictionary
*The "Normalized Recall'1 is here computed by a method different from
that used with SMART, and the difference in position on the plot is
of no significance.
Plot of Normalized Recall versus Number of Concept in the Dictionary,
Comparing three SMAflT Results with that from the Cranfield Project.
Fig. 9.