Group Representations for Decision Making under Risk and Uncertainty

47 Pages Posted: 20 Dec 2012

See all articles by G. Charles-Cadogan

G. Charles-Cadogan

University of Leicester; Ryerson University - Institute for Innovation and Technology Management

Date Written: December 15, 2012


This paper extends decision making under risk and uncertainty to group theory via representations of invariant behavioural space for prospect theory. First, we predict that canonical specifications for value functions, probability weighting functions, and stochastic choice maps are homomorphic. Second, we derive a continuous singular matrix operator T for affine transformation of a vector space of skewed S-shape value functions V isomorphic to a vector spaceW of inverted S-shaped probability weighting functions. To characterize the transformation, we decompose the operator into shear, scale and translation components. In that milieu, Moore-Penrose psuedoinverse transformation recovers value functions from probability weighting functionals. Removal of 0 from the point spectrum induces nonsingular operators that support group representation of stochastic choice maps in an invariant subspace of the general linear group GL(V). Third, we demonstrate how group theoretic operations on a gamble provide mathematical foundations of probability weighting functions that subsume the Prelec class. Fourth, we predict that a gamble is isomorphic to an invariant cyclic sub-group in weighted probablity space. This result implies that probability weighting functions [and value functions] fluctuate near their extremes, and explain violation of transitivity axioms in decision theory. Moreover, representations include the special unitary group SU(2) and orthogonal group Θ*3. The former includes Pauli’s spin matrices and accounts for skewness. It also provides microfoundations for construction of (1) behavioural stochastic processes from group character in the frequency domain; and (2) Schrödinger-Pauli Hamiltonian to compute, inter alia, time dependent probabilities in decision field theory.

Keywords: invariant behavior, group theory, representation theory, singular operator, prospect theory, decision field theory, risk and uncertainty, SU(2)

JEL Classification: C02, C44, C65, D03, D81

Suggested Citation

Charles-Cadogan, G., Group Representations for Decision Making under Risk and Uncertainty (December 15, 2012). Available at SSRN: or

G. Charles-Cadogan (Contact Author)

University of Leicester ( email )

University Road
Leicester, LE1 7RH
United Kingdom

Ryerson University - Institute for Innovation and Technology Management ( email )

575 Bay
Toronto, Ontario M5G 2C5

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