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Curvature of the Probability Weighting Function

  • George Wu

    (Department of Managerial Economics, Harvard Business School, Boston, Massachusetts 02163)

  • Richard Gonzalez

    (Department of Psychology, NI-25, University of Washington, Seattle, Washington 98195)

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    When individuals choose among risky alternatives, the psychological weight attached to an outcome may not correspond to the probability of that outcome. In rank-dependent utility theories, including prospect theory, the probability weighting function permits probabilities to be weighted nonlinearly. Previous empirical studies of the weighting function have suggested an inverse S-shaped function, first concave and then convex. However, these studies suffer from a methodological shortcoming: estimation procedures have required assumptions about the functional form of the value and/or weighting functions. We propose two preference conditions that are necessary and sufficient for concavity and convexity of the weighting function. Empirical tests of these conditions are independent of the form of the value function. We test these conditions using preference "ladders" (a series of questions that differ only by a common consequence). The concavity-convexity ladders validate previous findings of an S-shaped weighting function, concave up to p

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    Article provided by INFORMS in its journal Management Science.

    Volume (Year): 42 (1996)
    Issue (Month): 12 (December)
    Pages: 1676-1690

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    Handle: RePEc:inm:ormnsc:v:42:y:1996:i:12:p:1676-1690
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