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.
11-56
SPECIFIC RE[OCRerr]UESTS (63 relevant) GENERAL RE[OCRerr]UESTS (135 relevant)
PERFORMANCE CUT-oFF, n DOCUMENTS CUT-OFF, n DOCUMENTS
____________ =1 2 3 4 5 n= 1 2 3 4 5
OTAL
RETRIEVED 21 42 63 84 105 21 42 63 84 105
RELEVANT
RETRIEVED 8 17 24 25 26 11 20 27 33 38
NON-RELEV
RETRIEVED 13 25 39 59 79 10 22 36 51 67
RECALL .13 .27 .38 .4o .4i .08 e15 .20 .24 .28
.00314 .0Q943 .0091 .00246 .00886 .0164
FALLOUT .00604 .01426 .00541 .01255
PRECISION .38 .4i .38 .30 .25 .52 .48 .43 .39 .36
Cran-l Collection, Abstracts, Stem dictionary, Macro Aver[OCRerr]ge
over 21 Specific and 21 General Requests.
Details of C[OCRerr]parison of Specific and General Requests
at the First Five Document Cut-offs.
Fig. 30