Document (#8159)

Author

Robertson, S.E.

Title

Query-document symmetry and dual models

Source

Journal of documentation. 50(1994) no.3, S.233-238

Year

1994

Abstract

The idea that there is some natural symmetry between queries and documents is explained. If symmetry can be assumed, then it lead to a conception of 'dual' models in information retrieval (given a model, we can construct a dual model in which the roles of documents and queries are reversed). But symmetry breaks down in various ways, which may invalidate this construction. If we can construct a dual, it is not obvious that it can be combined with the original

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