Using Multiple External Collections for Query Expansion.
Dongqing Zhu, Ben Carterette · Text REtrieval Conference · 2011
First, we investigated the possibility of using query sessions from PubMed query logs for improving the estimation of a relevance model. In a typical search scenario, a user may submit multiple queries before she actually finds satisfactory search results. These closely related queries form a single query session which represents a single information need. By finding relevant query sessions with regard to a Medical Track topic we can incorporate into our relevance model useful query terms which reflect real information needs that are more or less related to the Medical Track topic.