Document (#16260)

Author

Brooks, T.A.

Title

¬The relevance aura of bibliographic records

Source

Information processing and management. 33(1997) no.1, S.69-80

Year

1997

Abstract

Relevance assessments of topical descriptors for bibliographic records were gathered for 2 dimensions: a vertical conceptual hierarchy of broad to narrow descriptors, and a horizontal linkage of related-terms spanning 3 descriptors. The data were analyzed for a semantic distance and semantic direction effect as postulated by the Semantic Distance Model (SDM). The vertical conceptual hierarchy exhibited a strong SDM effect. The horizontal linkages of related terms exhibited an attenuated semantic distance effect. Results showed that the horizontal semantic distance to nonrelevance is greater for semantically narrow records than for semantically broad records. Explains the difference by introducing the construct of the stride length of conceptual semantic steps. Horizontal semantic steps at the bottom of conceptual hierarchies are postulated to have smaller and more uniform stride lengths than horizontal horizontal semantic steps at the top of the conceptual hierachies. Relevance assessments in both dimensions were combined to visualize the relevance aura of bibliographic records. The aura for semantically narrow bibliographic records was found to be larger than the aura for semantically broad records

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