IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
Evaluation Parameters
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.
II-l~
NORMAL DEVIATE
+2 +1 0 -I -2
.98
.97 -2
.95
.90
-I
.80
.70
ERecol I[OCRerr] [OCRerr].50 1,
40
.30
.20
ADI 1963 PREPRINTS `I
6 METHODS
I I I I I I I I I I I I I II
.10
.03
.02
.01
.0102DS05 .10
.20.3040.50.60.70 80 90 959798 9 9
P(Rrr)
Erol Iout[OCRerr]
1--
w
0
Stem , `1Ett = 0e90 [OCRerr] Slope = 0.99
Thesaurus , 11E'1 = leOO [OCRerr] Slope = 0.83
ADI Abstracts, `tPseudo-Cranfieldv1 Cut-off Micro
Evaluation of 35 Requests.
Two "Operating Characteristic" [OCRerr]ves of Fallout Versus Recall
and 11E'1 values obtained, as suggested by Swets [3J.
Fig. 7.