ACSys TREC-7 Experiments

Experiments relating to TREC-7 Ad Hoc, HP and VLC tasks are described and results reported. Minor re nements of last year's Ad Hoc methods do not appear to have resulted in worthwile improvements in performance. However, larger bene ts were gained from automatic feedback than last year and concept scoring was very bene cial in the Manual Ad Hoc category. In the Automatic Ad Hoc category title-only performance seems to have su ered more severely than long-topic from a number of lexical scanning shortcomings and from an excessive stopword list. The HP track was used to validate the usibility of the combination of PADRE and the Quokka GUI. In the VLC track, the 100 gigabyte collection was indexed in under eight hours and moderately e ective queries were processed in less than two seconds.

• Type: Conference
• Year: 1998
• Where: TREC
• Authors: David Hawking, Nick Craswell, Paul B. Thistlewaite
• Keywords: Ad Hoc, Ad Hoc Category, Ad Hoc Methods, TREC 1998, TREC 2008