A WOWA-based Aggregation Technique on Trust Values Connected to Metadata

Authors:
Ernesto Damiani;Sabrina De Capitani di Vimercati;Pierangela Samarati;Marco Viviani
Affiliations:
Dipartimento di Tecnologie dell'Informazione, Università degli Studi di Milano, Via Bramante, 65 -- 26013 Crema (CR) -- Italia;Dipartimento di Tecnologie dell'Informazione, Università degli Studi di Milano, Via Bramante, 65 -- 26013 Crema (CR) -- Italia;Dipartimento di Tecnologie dell'Informazione, Università degli Studi di Milano, Via Bramante, 65 -- 26013 Crema (CR) -- Italia;Dipartimento di Tecnologie dell'Informazione, Università degli Studi di Milano, Via Bramante, 65 -- 26013 Crema (CR) -- Italia
Venue:
Electronic Notes in Theoretical Computer Science (ENTCS)
Year:
2006

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Abstract

Metadata produced by members of a diverse community of peers tend to contain low-quality or even mutually inconsistent assertions. Trust values computed on the basis of users' feedback can improve metadata quality and reduce inconsistency, eliminating untrustworthy assertions. In this paper, we describe an approach to metadata creation and improvement, where community members express their opinions on the trustworthiness of each assertion. Our technique aggregates individual trustworthiness values to obtain a community-wide assessment of each assertion. We then apply a global trustworthiness threshold to eliminate some assertions to reduce the metadatabase's overall inconsistency.