Decision with Dempster--Shafer belief functions: Decision under ignorance and sequential consistency

  • Authors:
  • Phan H. Giang

  • Affiliations:
  • George Mason University, 4400 University Dr., Fairfax, VA 22030, USA

  • Venue:
  • International Journal of Approximate Reasoning
  • Year:
  • 2012

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Abstract

This paper examines proposals for decision making with Dempster-Shafer belief functions from the perspectives of requirements for rational decision under ignorance and sequential consistency. The focus is on the proposals by Jaffray & Wakker and Giang & Shenoy applied for partially consonant belief functions. We formalize the concept of sequential consistency of an evaluation model and prove results about sequential consistency of Jaffray-Wakker's model and Giang-Shenoy's model under various conditions. We demonstrate that the often neglected assumption about two-stage resolution of uncertainty used in Jaffray-Wakker's model actually disambiguates the foci of a belief function, and therefore, makes it a partially consonant on the extended state space.