Accession Number : ADA295372

Title :   Reasoning Under Uncertainty.

Descriptive Note : Final technical rept. 15 Sep 91-14 Nov 94,

Corporate Author : IBM ALMADEN RESEARCH CENTER SAN JOSE CA

Personal Author(s) : Halpern, Joseph Y.

PDF Url : ADA295372

Report Date : 26 JAN 1995

Pagination or Media Count : 10

Abstract : This report summarizes the research performed under this contract. The research can he divided into four areas: (1) Computing degrees of belief, (2) Reasoning about knowledge and communication, (3) Nonmonotonic reasoning, and (4) Belief change. Topic (1) is concerned with how an agent such as a doctor should assign degrees of belief to events such as Tom has hepatitis given a large knowledge base of first-order and statistical information (such as 90% of patients with jaundice have hepatitis). The research in topic (2) focused on how knowledge changes as a result of communication and finding models for algorithmic (computable) knowledge. The work in topic (3) involved an analysis of the notion of only knowing and the introduction of a new tool to model model likelihood, plausibility measures. Finally, the work on topic (4) focused on finding appropriate models that could capture belief, plausibility, and time, and showing how they could be used to provide a deeper understanding of earlier work, as well as providing new results. Other highlights of the contract period are also listed, and a list of papers published under the contract is appended.

Descriptors :   *UNCERTAINTY, *REASONING, *JUDGEMENT(PSYCHOLOGY), ALGORITHMS, COMPUTATIONS, MODELS, TOOLS, STATISTICAL INFERENCE, PROBABILITY, STATISTICAL DATA, COMMUNICATION AND RADIO SYSTEMS, KNOWLEDGE BASED SYSTEMS, PHYSICIANS, HEPATITIS.

Subject Categories : Psychology
      Cybernetics

Distribution Statement : APPROVED FOR PUBLIC RELEASE