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The advantage of all probabilistic feedback models compared with the conventional vector modification methods,
is that the feedback process is directly related to the derivation of a weight for query terms. Indeed, the document
similarity function of expression (8) increases by a weighting factor of log[p,(l - u,)/u,(l - pi)] for each query
term i that matches a document, and this term weight is optimal under the assumed conditions of term independence and binary document indexing.
residual collection
aliku (public note) - 2005-04-19 02:42:49