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Experiments with Language-based Aids in Information Retrieval Systems

Published online by Cambridge University Press:  22 December 2008

Tove Fjeldvig and
Anne Golden
Tove Fjeldvig
Affiliation:
Statens Datasentral a.s., Ulvenveien 89 B, N-0581 Oslo 5, Norway.
Anne Golden
Affiliation:
Institutt for norsk som fremmedspråk, Universitetet i Oslo, Blindern, N-0316, Oslo 3, Norway.
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Abstract

The fact that a lexeme can appear in various forms causes problems in information retrieval. As a solution to this problem, we have developed methods for automatic root lemmatization, automatic truncation and automatic splitting of compound words. All the methods have as their basis a set of rules which contain information regarding inflected and derived forms of words – and not a dictionary. The methods have been tested on several collections of texts, and have produced very good results. By controlled experiments in text retrieval, we have studied the effects on search results. These results show that both the method of automatic root lemmatization and the method of automatic truncation make a considerable improvement on search quality. The experiments with splitting of compound words did not give quite the same improvement, however, but all the same this experiment showed that such a method could contribute to a richer and more complete search request.

Information

Type
Research Article
Information
Nordic Journal of Linguistics , Volume 11 , Issue 1-2 , June 1988, pp. 33 - 46
Copyright
Copyright © Cambridge University Press 1988

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References

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