Istituto di Scienza e Tecnologie dell'Informazione     
Nardini F. M., Perego R., Silvestri F., Capannini G. Diversifying search results using query logs. Technical report, 2010.
We study the problem of diversifying search results by ex- ploiting the precious knowledge stored in query logs. When an ambiguous or faceted query is submitted to a search en- gine, the user has often to reformulate it in order to better satisfy her information need by improving the perceived pre- cision of results returned. Our proposal exploits the pres- ence of different "specializations" of queries in query logs to detect the submission of ambiguous/faceted queries, and manage them by diversifying the search results returned to users, in a way that better covers the different possible inter- pretations of the query. We present an original formulation of the results diversification problem in terms of an objec- tive function to be maximized that admits the finding of an optimal solution in linear time. We evaluate our approach by using both the TREC Web diversification track method- ology, and a novel evaluation methodology based on query log analysis.
Subject Query log analysis
Search results diversification
H.3.3 Information Search and Retrieval. Query formulation
H.3.3 Information Search and Retrieval. Search process
H.3.3 Information Search and Retrieval. Selection process

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