The Co-Effects of Query Structure and Expansion on RetrievalPerformance in Probabilistic Text Retrieval
作者： Jaana Kekäläinen , Kalervo Järvelin
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摘要: The effects of query structures and expansion (QE) on retrieval performance were tested with a best match system (InQuery^1). Query structure means the use operators to express relations between search keys. Six different tested, representing strong (e.g., queries facets or concepts identified) weak (no identified, is ‘a bag keys’). QE was based concepts, which first selected from searching thesaurus, then expanded by semantic relationships given in thesaurus. levels (a) no expansion, (b) synonym (c) narrower concept (d) an associative (e) cumulative all other expansions. With Boolean structured queries, not very effective. achieved combination facet structure, where keys within treated as instances one key (the SYN operator), largest expansion.
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