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.
Interpolated Curve
- - Original Curve
Precision
Precision 0.6
1.0 0.5
0.8
I,
I I
0.6I
0.4 I-
I [OCRerr]
0.2
I I I I
I
0 0.2 0.4 0.6 0.8 1.0
Ranks of N'ive Relevant are [OCRerr]
Recall
a) Curve for Individual Request [OCRerr] 268
Cran-l, Thesaurus-2, using Recall
levels cut-off - "Semi-Cranfield"
Method
Recall Level Cut-off, NQua8i[OCRerr]Cr
I'
Recall Level Cut-off, tmSemi - Ci
Document Cut-off, *Pieudo-[OCRerr]
I'
-0->
¼
K
I I I Reco
0.2 0.4 0.6 0.8 1.0
Cran-l, Abstracts, Thesaurus-3, Macro
Evaluation of 42 Requests
b) Average Curve to C[OCRerr]pare Cut-offs
0.4
0.3
0.2 -
0.1
0
Illustrations of the Recall Levels Cut-off - "Semi-Cranfield" Method
Fig. 17