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.
11-10
Recall Precisio[OCRerr] after retrieval
of n documents
C
0
(0
0,
Number
[OCRerr] (x = Relevant) Recall Precision
1 588 x 0.2 1.0
2 589 x 0.[OCRerr] 1.0
3 576 o.'4 0.67
[OCRerr] 590 x 0.6 0.75
5 986 0.6 o.6o
6 592 x o.8 0.67
7 9si[OCRerr] o.8 0.57
8 988 o.8 0.50
9 578 o.8 o.[OCRerr]4
10 985 o.8 0.[OCRerr]0
11 103 o.8 0.36
12 591 o.8 0.33
13 772 x 1.0 0.38
l[OCRerr] 990 1.0 0.36
1.0
0.8
0.6
0.4
2
31<>
5
12
[OCRerr]I[OCRerr]4
0.2 25
0 Q2 0.4 0.6 0.8 1.0
Recoil
Result of Cran-l Individual Request [OCRerr]68, Thesaurus-2
Showi[OCRerr] Evaluation Using a Graph of Precision Versus Recall
Fig. [OCRerr].