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    Where the Linked Dependence Assumption Fails and How to Move Beyond It

    19th Annual BCS-IRSG Colloquium on IR

    Aberdeen, UK. 8th - 9th April 1997


    B. Mateev, E. Mittendorf & P. Schäuble


    The linked dependence assumption, a widely used simplification in probabilistic retrieval, is briefly reviewed and its validity is investigated.

    We show that the linked dependence assumption is violated particularly if the query features are good discriminators between relevant and non-relevant documents.

    We then propose the manual concept generation method, which takes into account the dependence between different query concepts.

    For a limited set of routing queries, experiments show a significant improvement when compared with retrieval methods which do not take into account feature dependencies.

    We consider this method to be the first successful step which progresses beyond the linked dependence assumption.


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