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-8
REI[OCRerr]VANT DOCUMENTS
Rank Number Correlation
1 588 .5764
2 589 [OCRerr]
4 590 .3833
6 592 .3523
13 772 .2092
1,2,4,6,13 - I 1,2,3,4,5
Normalized Recall = 1-
= 0.9887
5(200 - 5)
[OCRerr]log 1,2,4,6,13 -
I log 1,2,3,4,5
Normalized Precision = 1 -
200.'
log (200 - 5).' 5.'
= 0.9238
Result of Cran-l Individual Request 0268, Thesaurus-2,
Showing Evaluation Using the Normalized Measures.
Figure 3.