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Approximating Moments by Nonlinear Transformations

Author

Listed:
  • Karim M. Abadir

    (Imperial College London, UK)

  • Adriana Cornea

    (Imperial College London, UK)

Abstract

We provide a methodology to calculate the expectation of a variate x in terms of the moments of a transformation of x. Apart from the intrinsic interest in such a fundamental relation that relates the moments of a variate and its nonlinear transformations, our results can be used in practice to approximate E(x) by the low-order moments of a transformation which can be chosen to give a good approximation for E(x). To obtain an accurate evaluation of the remainder, we derive results for the bounding of functions of complex variables. Our results are useful, for example, in resampling applications like bootstrap confidence intervals for fat-tailed data. They are also useful in economics and finance in quantifying the effect of taking nonlinear transformations on moment conditions and on asset prices which are formulated as expectations.

Suggested Citation

  • Karim M. Abadir & Adriana Cornea, 2012. "Approximating Moments by Nonlinear Transformations," Working Paper series 22_12, Rimini Centre for Economic Analysis.
    • Handle: RePEc:rim:rimwps:22_12
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    References listed on IDEAS

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    1. David Backus & Mikhail Chernov & Ian Martin, 2011. "Disasters Implied by Equity Index Options," Journal of Finance, American Finance Association, vol. 66(6), pages 1969-2012, December.
    2. Karim M. Abadir & Jan R. Magnus, 2002. "Notation in econometrics: a proposal for a standard," Econometrics Journal, Royal Economic Society, vol. 5(1), pages 76-90, June.
    3. Karim Abadir, 1999. "An introduction to hypergeometric functions for economists," Econometric Reviews, Taylor & Francis Journals, vol. 18(3), pages 287-330.
    4. Abadir, Karim M. & Talmain, Gabriel, 2005. "Autocovariance functions of series and of their transforms," Journal of Econometrics, Elsevier, vol. 124(2), pages 227-252, February.
    5. Ian W. R. Martin, 2008. "Disasters and the Welfare Cost of Uncertainty," American Economic Review, American Economic Association, vol. 98(2), pages 74-78, May.
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