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The HAIRCUT System at TREC-9

By Paul McNamee, James Mayfield and Christine Piatko


he token stream. The text was lowercased, punctuation was removed, and diacritical marks were retained. Tokens containing digits were preserved; however only the first two of a sequence of digits were retained (e.g., 1920 became 19##). The result is a stream of blank-separated words. When using n-grams we construct indexing terms from the same sequence of words. These n-grams may span word boundaries; an attempt is made to discover sentence boundaries so that n-grams spanning sentence boundaries are not recorded. Thus n-grams with leading, central, or trailing spaces are formed at word boundaries. Queries were parsed in the same fashion as were documents with two exceptions. On some of our title only runs we attempted to correct the spelling of words that did not occur in our dictionary. Also, we tried to remove stop structure from the description and narrative sections of the queries using a list of about 1000 phrases constructed from past TREC topic statements. # docs # terms ind

Year: 2001
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