QACTIS Enhancements in TREC QA-2006
DEPARTMENT OF DEFENSE FORT GEORGE G MEADE MD
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The QACTIS system has been tested in previous years at the TREC Question Answering Evaluations. This paper describes new enhancements to the system specific to TREC-2006, including basic improvements and thresholding experiments, filtered and Internet-supported pseudo-relevance feedback for information retrieval, and emerging statistics-driven question-answering. For contrast, we also compare our TREC-2006 system performance to that of our top systems from TREC-2004 and TREC-2005 applied to this years data. Lastly, we analyze evaluator-declared unsupportedness of factoids and nugget decisions of other questions to understand major negative changes in performance for these categories over last year.
- Information Science