Aggregating local transactional ratings Sample Clauses

Aggregating local transactional ratings. To obtain a service consumer’s local trust over a service provider, local transactional ratings generated from the service consumer’s past service transactions with the service provider need to be aggregated. In the aggregation, we consider the temporal dimension when evaluating the credibility of the local transactional ratings. It is not only their values that matter, but also at what time they are recorded – we assume that the local transactional ratings are recorded upon the completion of the service transactions, which is also when the attached SLA is completed. The credibility of a local transactional rating diminishes as time elapses. The ratings over a service consumer’s recent service transactions with a service provider are more credible than the old ones. Also, when combining a service consumer’s and other service consumers’ personal local trust (as detailed in Section 26.2.3), the recent ratings from one service consumer are more credible than the old ones from another service consumer. We use exponential moving average (EMA) scheme [21] to aggregate a service consumer’s local transactional ratings over a service provider. Weights are computed to represent the credibility of the ratings according to how old they are. The weight of each older rating decreases exponentially, giving more credibility to recent ratings whilst not entirely discarding older ones. By doing so, short-term fluctuation of ratings can be smoothed out and long-term trend can be highlighted. Since the threshold between short-term and long-term is application specific, ServiceTrust uses parameterθ , as a time window, to specify valid ratings when aggregating the local transactional ratings. Ratings lying outside ofθ are considered obsolete and thus discarded in the aggregation. θ can be set accordingly by the application developers to meet the requirements of applications.
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