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August 2016 Higher order elicitability and Osband’s principle
Tobias Fissler, Johanna F. Ziegel
Ann. Statist. 44(4): 1680-1707 (August 2016). DOI: 10.1214/16-AOS1439

Abstract

A statistical functional, such as the mean or the median, is called elicitable if there is a scoring function or loss function such that the correct forecast of the functional is the unique minimizer of the expected score. Such scoring functions are called strictly consistent for the functional. The elicitability of a functional opens the possibility to compare competing forecasts and to rank them in terms of their realized scores. In this paper, we explore the notion of elicitability for multi-dimensional functionals and give both necessary and sufficient conditions for strictly consistent scoring functions. We cover the case of functionals with elicitable components, but we also show that one-dimensional functionals that are not elicitable can be a component of a higher order elicitable functional. In the case of the variance, this is a known result. However, an important result of this paper is that spectral risk measures with a spectral measure with finite support are jointly elicitable if one adds the “correct” quantiles. A direct consequence of applied interest is that the pair (Value at Risk, Expected Shortfall) is jointly elicitable under mild conditions that are usually fulfilled in risk management applications.

Citation

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Tobias Fissler. Johanna F. Ziegel. "Higher order elicitability and Osband’s principle." Ann. Statist. 44 (4) 1680 - 1707, August 2016. https://doi.org/10.1214/16-AOS1439

Information

Received: 1 April 2015; Revised: 1 January 2016; Published: August 2016
First available in Project Euclid: 7 July 2016

zbMATH: 1355.62006
MathSciNet: MR3519937
Digital Object Identifier: 10.1214/16-AOS1439

Subjects:
Primary: 62C99
Secondary: 91B06

Rights: Copyright © 2016 Institute of Mathematical Statistics

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Vol.44 • No. 4 • August 2016
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