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Binary Independence Model

  • Since xi is either 0 or 1:

  • Let Pi = P(xi = 1 | R,q);  rt = p (xi =1 | NR,q)

  • Assume, for all terms not occurring in the query (qi=0) pi = ri

  • Then...                                                                   (This can be changed (e.g.,

                                                                                        in relevance feedback)

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