On term selection for query expansion
Journal of Documentation
Exploiting redundancy in question answering
Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval
Condorcet fusion for improved retrieval
Proceedings of the eleventh international conference on Information and knowledge management
Implementation of the SMART Information Retrieval System
Implementation of the SMART Information Retrieval System
Advances in Open Domain Question Answering
Advances in Open Domain Question Answering
Overview of the Reliable Information Access Workshop
Information Retrieval
Overview of the Reliable Information Access Workshop
Information Retrieval
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Experiments were conducted to explore the impact of combining various components of eight leading information retrieval systems. Each system demonstrated improved effectiveness through the use of blind feedback, also known as pseudo-relevance feedback, a form of query expansion. Blind feedback uses the results of a preliminary retrieval step to augment the efficacy of a secondary retrieval step. The hybrid combination of primary and secondary retrieval steps from different systems in a number of cases yielded better effectiveness than either of the constituent systems alone. This positive combining effect was observed when entire documents were passed between the two retrieval steps, but not when only the expansion terms were passed. Several combinations of primary and secondary retrieval steps were fused using the CombMNZ algorithm; all yielded significant effectiveness improvement over the individual systems, with the best yielding an improvement of 13% (p = 10驴6) over the best individual system and an improvement of 4% (p = 10驴5) over a simple fusion of the eight systems.