On non-specific evidence

Authors:

  • Schubert Johan

Publish date: 1992-01-28

Report number: FOA C 20856-2.7

Pages: 14

Written in: English

Abstract

Dempster-Shafer theory, which is a way to manage uncertain information, is based upon that one has evidences for and/or against one or more different propositions. Dempster-Shafer theory contains a rule for the fusion of these evidences, Dempster´s rule. When reasoning simultaneously with evidences about different events it is necessary to separate the evidence according to event. These events should then be handled independently. However, when propositions of evidences are weakly specified in the sense that it may not be certain to which event they are referring this may not be directly possible. In this paper a criterion for partitioning evidences into subsets representing events is established. This criterion, derived from the conflict within each subset, involves minimizing a criterion function for the overall conflict of the partition. An algorithm based on characteristics of the criterion function and an iterative optimization among partitionings of evidences is proposed.