Accession Number:

ADA463732

Title:

QACTIS Enhancements in TREC QA-2006

Descriptive Note:

Conference paper

Corporate Author:

DEPARTMENT OF DEFENSE FORT GEORGE G MEADE MD

Report Date:

2006-01-01

Pagination or Media Count:

10.0

Abstract:

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.

Subject Categories:

  • Information Science
  • Linguistics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE