Grey Relational Analysis for Query Expansion

For one-sidedness of the various qualitative expansion methods, we propose a query terms selection method based on Grey Relational Analysis (GRA).We called the fusion expansion technique with GRA (FET-GRA). It calculates weight of expansion term by varied qualitative expansions and comprehensive weight by FET-GRA and thus extracts expansion term in terms of the weight. The experiment result of TREC dataset shows the method (FET-GRA) is substantially superior to TF-IDF, Mutual Information , Local Context Analysis.