Abstract not found

e passes. Two pairs of runs were submitted: in one pair queries remained constant, but in the other query terms were reweighted when fresh relevance information became available. VLC track Four runs on the full database were submitted, together with one each on the 10# and 1# collections. Unexpectedly, unexpanded queries did better than expanded ones; the best run used all topic #elds and some adjacent term pairs from the topics. The best expanded run used one of the TREC#7 ad hoc query sets #expanded on disks 1#5#. Interactive track Two pairwise comparisons were made: Okapi with relevance feedback against Okapi without, and Okapi without against ZPrise without. Okapi without performed somewhat worse than ZPrise, and Okapi with only partially recovered the de#cit. # Microsoft Research Ltd, 1 Guildhall Street, Cambridge CB2 3NH, UK, and City University, London, UK. email ser@microsoft.com y Microsoft Research Ltd, 1 Guildha

this paper; comparisons between passage and non-passage runs can be seen in a few of the tables.

This report is concerned with the Adaptive Filtering and Web tracks. There are separate reports in this volume [1, 2] on the Microsoft Research Redmond participation in QA track and the Microsoft Research Beijing participation in the Web track. Two runs