<DOC>
<DOCNO> IRS13 </DOCNO>
<TITLE> Scientific Report No. IRS-13 Information Storage and Retrieval </TITLE>
<SUBTITLE> Thesaurus, Phrase and Hierarchy Dictionaries </SUBTITLE>
<TYPE> chapter </TYPE>
<PAGE CHAPTER="7" NUMBER="48">
<AUTHOR1> E. M. Keen </AUTHOR1>
<PUBLISHER> Harvard University </PUBLISHER>
<EDITOR1> Gerard Salton </EDITOR1>
<COPYRIGHT MTH="December" DAY="" YEAR="1967" BY="National Science Foundation">
Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government.
</COPYRIGHT>
<BODY>
VII-~8
Collection Stem Dictionary Thesaurus Dictionary
and Relevant Relevant
Request Rank Document Corr. Rank Document Corr.
33 09 .1512 1 09 .4100
ADI 48 70 .0977 7 48 .3062
QBl0 58 69 .0769 26 70 .1825
4 rel. 67 48 .0599 32 69 .1268
Normed4 Recal[OCRerr] .3718 Nozrned. Recall .8205
Normed. [OCRerr] .1336 Normed. Precision .6180
9 200 .3539 106 200 .2448
IRE-3 71 382 .2503 153 106 .2044
QOlS 212 106 .1630 189 382 .1815
6 rel. 309 71H .1210 283 71H .1390
498 85A .0563 301 85A .1315
691 72[OCRerr] .0000 669 72+ .0000
Normed. Recall .6191 Normed. Recall .6382
Normed. Precision .2889 Normed. Precision .2141
Retrieval Results for Two Individual Requests Comparing Stem
with Thesaurus
Fig. 29
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