Jean-Yves Jaffray (1939–2009) was a

French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

and

economist An economist is a professional and practitioner in the social sciences, social science discipline of economics. The individual may also study, develop, and apply theories and concepts from economics and write about economic policy. Within this ...

who made influential contributions in the fields of

decision theory Decision theory (or the theory of choice; not to be confused with choice theory) is a branch of applied probability theory concerned with the theory of making decisions based on assigning probabilities to various factors and assigning numerical ...

and

mathematical statistics Mathematical statistics is the application of probability theory, a branch of mathematics, to statistics, as opposed to techniques for collecting statistical data. Specific mathematical techniques which are used for this include mathematical an ...

.A. Bouyssou et al., Decision Making Process: Concepts and MethodsM. Cohen, Tribute to Jean-Yves Jaffray He pioneered methods in decision theory such as linear utility theory for belief functions,Jaffray, Jean-Yves (1989). "Linear utility theory for belief functions"P.H. Giang, On Jaffray’s Decision Model for Belief Functions bridging the gap between expected utility and the maximin rule by using

subjective probability Bayesian probability is an interpretation of the concept of probability, in which, instead of frequency or propensity of some phenomenon, probability is interpreted as reasonable expectation representing a state of knowledge or as quantification o ...

to encompass belief functions.

References

1939 births 2009 deaths French mathematicians {{France-mathematician-stub