Question answering system using Q & A site corpus Query expansion and answer candidate evaluation

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Table 1 Results of experiments of query expansion

This table summarizes the top-5 accuracies and MRR of the systems for the experiments of the query expansion. Original method in the table represents the method proposed by Berger et al. (2000), where the words to be added are chosen based on mutual information between a word from a question and another word in its answer. This table indicates that the system with the proposed method outperformed the two systems: the system without query expansion and the system with the method proposed by Berger et al. (2000).