Trend Information Extraction Based on Relative Expression Participated on MuST T2N Subtask.
Yasuhiro Uenishi, Fumito Masui, Tatsuaki Matsuba, Atsuo Kawai, Naoki Isu · NTCIR · 2008
Basic Elements (Quadruplet) This paper describes a system participating in the MuST T2N subtask. To the participating system, we applied the method of implicit trend information extraction utilizing relative expressions such as ``0.1%増(grew 0.1%)'', ``前年 (previous year)'' and ``過去最高(maximum)''. Relative differences and numerical changes in trend information can be signified by relative expressions. The system extracts elements of four types by pattern-based rules considering th l ti i Th t t d l t i d Relative Expression and Quadruplet On the basis of the MuST definition, we defined a quadruplet, which is a set of four basic elements: name, par, date and val. In MuST corpus, the four elements are tagged. Extraction of quadruplets 1999年のパソコン出荷台数は前年比36.7%増の