SP500215 Appendix B: System Features Appendix National Institute of Standards and Technology D. K. Harman HL SEARCHING (CON'1) em occurrence frequencies in titles were doubled in some collections. sriables used were: optimally relativized query and document stem frequencies, global relative frequency of stem in all document texts, 2nd routing run: stem-1. nk type weight that reflects relative importance of different lexical relations; set to 0.5 for these experiments. sofar as terms, closely related to selected synonym sets are added to query. [OCRerr]ne normalization of weights in both documents and queries. sed subjectively when choosing synsets to add. [utual Information Measure determines how phrases are evaluated, which indirectly affects the rank. [OCRerr] use maximum Th though, which seems to be correlated with document length. [odified per SMART ann ranking given above. idirectly via use of maximum term frequency.