Report on TREC-9 Ellen M. Voorhees National Institute of Standards and Technology ellen.voorhees~nist.gov 1 Introduction The ninth Text REtrieval Conference (TREC-9) was held at the National Institute of Standards and Technology (NIST) on November 13-16, 2000. The conference was co-sponsored by NIST, the Information Technology Office of the Defense Advanced Research Projects Agency (DARPA/ITO), and the Advanced Research and Development Activity (ARDA) office of the Department of Defense. TREC-9 is the latest in a series of workshops designed to foster research in text retrieval. The workshop series has four goals: * to encourage research in text retrieval based on large test collections; , to increase communication among industry, academia, and government by creating an open forum for the exchange of research ideas; ¢ to speed the transfer of technology from research labs into commercial products by demonstrating substantial improvements in retrieval methodologies on real-world problems; and ¢ to increase the availability of appropriate evaluation techniques for use by industry and academia, including development of new evaluation techniques more applicable to current systems. The previous eight TRECs each had an "ad hoc" main task through which eight large test collections were built [8]. In recognition that sufficient infrastructure exists
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