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Subject Index

accessible item, 162accuracy change, 162

betweenness, 164betweenness utility, 165bilattice, 16bipolarity, 13

cold start problem, 96, 154collaborative filtering, 5, 94, 110connector, 158content-based filtering, 5, 93controversial item, 105controversiality, 102copy-profile attack, 97CouchSurfing, 2, 43, 75, 99coverage, 101

debugged trust-based collaborative filtering,139

debugged trust-based weighted mean, 139distrust, 12distrust boundary preservation, 56distrust monotonicity, 58distrust ordering, 19distrust-based collaborative filtering, 142distrust-based filtering, 138

Eigentrust, 11EnsembleTrustCF, 131entropy, 104Epinions, 2, 10, 25, 43, 75, 99, 126, 143, 157

FATP, 54FilmTrust, 99, 114, 184FPTA, 54fragmentation, 166

frequent rater, 158fuzzy logic, 11fuzzy relation, 21fuzzy set, 21

Grouplens, 93

idempotency, 56ignorance, 14, 34, 59inconsistency, 14, 60induced ordered weighted average, 53

Kevin Bacon Oracle, 24knowledge absorption, 31knowledge boundary preservation, 56knowledge defect, 17knowledge monotonicity, 29, 57

leave-one-out method, 46level of disagreement, 105

maven, 158mean absolute error, 46, 100Moleskiing, 114MoleTrust, 120Movielens, 98multi-agent system, 9

negator, 37Netflix, 5, 98

opposite arguments condition, 60ordered weighted average, 52orness degree, 53

Pearson’s correlation coefficient, 95

201

202 Trust Networks for Recommender Systems

propagation horizon, 121

recommender system, 4, 25, 33, 91room for originality, 168root mean square error, 75, 100

Semantic Web, 9small world phenomenon, 24small-network theory, 24social network, 1standard deviation, 102subjective logic, 11, 16, 54

TidalTrust, 115triangular conorm, 37triangular norm, 35trust aggregation, 3, 53

associativity, 59K-IOWA, 74K-OWA, 65KAAV, 69KK-OWA, 71knowledge maximizing operator, 64knowledge preference averaging operator, 64operators, 61trust maximizing operator, 63

trust boundary preservation, 56trust decay, 28

trust metric, 3, 25trust model

gradual, 11probabilistic, 11

trust monotonicity, 30, 58trust network, 2, 20trust ordering, 19trust propagation, 3, 26

associativity, 30atomic, 26cocitation, 26operators, 39transitivity, 26transpose trust, 26trust coupling, 26

trust provenance, 13trust score, 16

consistent, 31, 42, 57incomplete, 17inconsistent, 17

trust score space, 17trust-based collaborative filtering, 119trust-based filtering, 124trust-based weighted mean, 115trust-distrust monotonicity, 57trusted third party, 26

Web of Trust, 5, 10, 25

BibliographySubject Index