SP500215 Appendix B: System Features Appendix National Institute of Standards and Technology D. K. Harman HC. QUERY CONSlItUCIION -- Fl[OCRerr]EDBACK (ADHOC) PSThM NAME I [OCRerr] ERIM [OCRerr] ThIC [__CITRI [OCRerr] UCLA [[OCRerr] SEC [OCRerr] [OCRerr]iII I: (adhoc) None No feedback _______________________ ____________ __________________ _________ methods Liely Manual or Manual Automatic C (See uB) ____________ ______________ ___________ (See lIA) ___________ _____________ Searchers: [OCRerr]rson doing feedback ([OCRerr]) Searchers 1 faculty ____________________ (as IIB) _________ ___________ _________ 1 Ph.D. student __________ rime for complete feedback Varies, about 20- Information not time (cpu seconds) 300 [1] available ____________ Information not time (minutes) 10-120 available 2.0 (initial query + 1 lumber of iterations 2.0 feedback iteration) __________ _____________ ige number of Documents [OCRerr]eration 13.3 17.8 I number of Iterations 0 2 I number of Iterations 4 2 When 10 relevant documents were ermines end of Iteration Searcher decides found, or when 20 documents had been examined. methods used inatic Term Reweighting ________________ ___________ _____________ matic Query Expansion (+) 2, 3 [2] ____________ _____________ ___________ 2,3 (3] __________ _____________ [OCRerr]r automatic methods ual Methods terms in relevant documents added [OCRerr]) only top X terms added (c) user selected terms added