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Subjective logic operators in trust assessment: an empirical study

Subjective logic operators in trust assessment: an empirical study
Subjective logic operators in trust assessment: an empirical study
Computational trust mechanisms aim to produce trust ratings from both direct and indirect information about agents’ behaviour. Subjective Logic (SL) has been widely adopted as the core of such systems via its fusion and discount operators. In recent research we revisited the semantics of these operators to explore an alternative, geometric interpretation. In this paper we present principled desiderata for discounting and fusion operators in SL. Building upon this we present operators that satisfy these desirable properties, including a family of discount operators. We then show, through a rigorous empirical study, that specific, geometrically interpreted, operators significantly outperform standard SL operators in estimating ground truth. These novel operators offer real advantages for computational models of trust and reputation, in which they may be employed without modifying other aspects of an existing system.
1572-9419
743-762
Cerutti, Federico
fec75499-632a-460f-987a-1a09420d8cb1
Kaplan, Lance
a645f3d7-9b77-40fb-ada7-903bedb28a25
Norman, Timothy
663e522f-807c-4569-9201-dc141c8eb50d
Oren, Nir
00646ccd-977b-4442-88c7-d18089b26670
Toniolo, Alice
e54ad578-9232-471a-a5d7-cd3a7bc70872
Cerutti, Federico
fec75499-632a-460f-987a-1a09420d8cb1
Kaplan, Lance
a645f3d7-9b77-40fb-ada7-903bedb28a25
Norman, Timothy
663e522f-807c-4569-9201-dc141c8eb50d
Oren, Nir
00646ccd-977b-4442-88c7-d18089b26670
Toniolo, Alice
e54ad578-9232-471a-a5d7-cd3a7bc70872

Cerutti, Federico, Kaplan, Lance, Norman, Timothy, Oren, Nir and Toniolo, Alice (2015) Subjective logic operators in trust assessment: an empirical study. Information Systems Frontiers, 17 (4), 743-762. (doi:10.1007/s10796-014-9522-5).

Record type: Article

Abstract

Computational trust mechanisms aim to produce trust ratings from both direct and indirect information about agents’ behaviour. Subjective Logic (SL) has been widely adopted as the core of such systems via its fusion and discount operators. In recent research we revisited the semantics of these operators to explore an alternative, geometric interpretation. In this paper we present principled desiderata for discounting and fusion operators in SL. Building upon this we present operators that satisfy these desirable properties, including a family of discount operators. We then show, through a rigorous empirical study, that specific, geometrically interpreted, operators significantly outperform standard SL operators in estimating ground truth. These novel operators offer real advantages for computational models of trust and reputation, in which they may be employed without modifying other aspects of an existing system.

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e-pub ahead of print date: 23 August 2014
Published date: August 2015
Organisations: Agents, Interactions & Complexity

Identifiers

Local EPrints ID: 403391
URI: https://eprints.soton.ac.uk/id/eprint/403391
ISSN: 1572-9419
PURE UUID: 005e19fb-bc34-43ae-9d7d-c08d86fa036b
ORCID for Timothy Norman: ORCID iD orcid.org/0000-0002-6387-4034

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Date deposited: 30 Nov 2016 14:50
Last modified: 06 Jun 2018 12:19

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