Abstract This paper describes an overview,of the Opinion Analysis Pilot Task from 2006 to 2007 at the Sixth NT- CIR Workshop. We created test collection for 32, 30, and 28 topics (11,907, 15,279, and 8,379 sentences) in Chinese, Japanese and English. Using this test col- lection, we conducted opinion extraction subtask. The subtask was defined from four perspectives: (a) opin- ionated sentence
... [Show full abstract] judgment, (b) opinion holder extrac- tion, (c) relevance sentence judgment, and (d) polarity judgment. 21 run results were submitted by 14 partici- pants with five results submitted by the organizers. We show the evaluation results of the groups participating in opinion extraction subtask. Keywords: Opinion Extraction, Opinion Holder, Rel- evance, Polarity, and NTCIR.