Jean-Yves Jaffray (1939–2009) was a

French French may refer to: * Something of, from, or related to France ** French language, which originated in France ** French people, a nation and ethnic group ** French cuisine, cooking traditions and practices Arts and media * The French (band), ...

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, mathematical structure, structure, space, Mathematica ...

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 rational choice is a branch of probability theory, probability, economics, and analytic philosophy that uses expected utility and probabilities, probability to model how individuals would behave Rationality, ratio ...

and

mathematical statistics Mathematical statistics is the application of probability theory and other mathematical concepts to statistics, as opposed to techniques for collecting statistical data. Specific mathematical techniques that are commonly used in statistics inc ...

.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 ( or ) 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 quanti ...

to encompass belief functions.

References

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