Document Type

Article

Date

2002

Keywords

Information retrieval, TREC-2002 question-answering track, Question answering system, Linguistic patterns, Keywords

Language

English

Disciplines

Information and Library Science

Description/Abstract

This paper describes the retrieval experiments for the main task and list task of the TREC-2002 question-answering track. The question answering system described automatically finds answers to questions in a large document collection. The system uses a two-stage retrieval approach to answer finding based on matching of named entities, linguistic patterns, keywords, and the use of a new inference module. In answering a question, the system carries out a detailed query analysis that produces a logical query representation, an indication of the question focus, and answer clue words.