Probabilistic Models

• Model 1 -- Probabilistic Indexing, P(R|y,Di)

• Model 2 -- Probabilistic Querying, P(R|Qj,x)

• Model 3 -- Merged Model, P(R| Qj, Di)

• Model 0 -- P(R|y,x)

• Probabilities are estimated based on prior usage or relevance estimation

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