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Abstract: We introduce a new, probabilistic model for combining the outputs of an arbitrary number of query retrieval systems. By gathering simple statistics on the average performance of a given set of query retrieval systems, we construct a Bayes optimal mechanism for combining the outputs of these systems. Our construction yields a metasearch strategy whose empirical performance nearly always exceeds the performance of any of the constituent systems. Our construction is also robust in the sense that if ``good'' and ``bad'' systems are combined, the performance of the composite is still on par with, or exceeds, that of the best constituent system. Finally, our model and theory provide theoretical and empirical avenues for the improvement of this metasearch strategy.

Note: Preliminary version appeared in SIGIR 2000.

Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]

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   Javed A. Aslam and Mark Montague, "Bayes Optimal Metasearch: A Probabilistic Model for Combining the Results of Multiple Retrieval Systems." Dartmouth Computer Science Technical Report TR2000-382, December 2000.

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