IRS13
Scientific Report No. IRS-13 Information Storage and Retrieval
An Analysis of the Documentation Requests
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.
X-32
REI[OCRerr][OCRerr]VANT RAN1[OCRerr] OF REI[OCRerr]VANT AND
RE[OCRerr]U[OCRerr][OCRerr]T D0C[OCRerr][OCRerr]NT NORMALIZED MEASURES
NUMBER 1tORIGINAL" `1MODIFIED"
Request A4 1 1
(2 Relevant) 29 30 43
63 NR .8250 [OCRerr] .7437
NP .666o NP .6216
Request A7 1 2
19 6 i4
07 8 16
(4 Relevant) 09 25 19
4o NH .9038 NR .8686
NP .7279 NP .5916
Results of Two Requests in Which Manual Modification
by [OCRerr]ortant Term Weighting is worse than the Original
Unmodified Search
Figure 19.