Experiments on the TREC-9 Filtering Track

KDD R&D Laboratories has been participating in previous TREC conferences with the cooperation of students from Waseda University. This year, KDD R&D Laboratories and Waseda University are o cially participating as a joint research team. We have focused our experiments for TREC-9 on the adaptive ltering experiments of the Filtering Track. Our goal was to evaluate the ltering method using a non-relevant information pro le. We have also made experiments of a new feedback method to increase the accuracy of pseudo feedback. In this paper, we will describe our ltering methods, and present results of our evaluations.