The RMIT/CSIRO Ad Hoc, Q&A, Web, Interactive, and Speech Experiments at TREC 8

The constants k1, k3 and b were set to 1.2, 1000 and 0.75 respectively, as recommended by the City University group [13]. Wd is the length of the document d in bytes and avr Wd is the average document length in the entire collection. N is the total number of documents in the collection, ft is the number of documents in which term t occurs, and fx;t is the frequency of term t in either a document d, passage p or query q. For passage ranking, queries and passages were matched using a non-normalised version of the cosine similarity function:

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