A Dynamic Autoregressive Expectile for Time-Invariant Portfolio Protection Strategies

66 Pages Posted: 16 Feb 2009 Last revised: 10 Feb 2018

See all articles by Benjamin Hamidi

Benjamin Hamidi

Université Paris I Panthéon-Sorbonne - CES/CNRS

Bertrand B. Maillet

EMLyon Business School (Paris Campus)

Jean-Luc Prigent

University of Cergy-Pontoise - ThEMA

Date Written: September 10, 2009

Abstract

Among the most popular techniques for portfolio insurance strategies that are used nowadays, the so-called "Constant Proportion Portfolio Insurance" (CPPI) allocation simply consists in reallocating the risky part of a portfolio according to the market conditions. This general method crucially depends upon a parameter - called the multiple - guaranteeing a predetermined floor whatever the plausible market evolutions. However, the unconditional multiple is defined once and for all in the traditional CPPI setting; we propose in this article an alternative to the standard CPPI method, based on the determination of a conditional multiple. In this time-varying framework, the multiple is conditionally determined in order the risk exposure to remain constant, but depending on market conditions. We thus propose to define the multiple as a function of Expected Shortfall.

After briefly recalling the portfolio insurance principles, the CPPI framework and the main properties of the conditional or unconditional multiples, we present a Dynamic AutoRegressive Expectile (DARE) class of models for the conditional multiple in a time-varying strategy whose aim is to adapt the current exposition to market conditions following a traditional risk management philosophy. We illustrate this approach in a Time-Invariant Portfolio Protection (TIPP) strategy, as introduced by Estep and Kritzman (1988), which aims to increase the protected floor according to the insured portfolio performance. Finally, we use an option valuation approach for measuring the gap risk in both conditional and unconditional approaches.

Keywords: CPPI, Expectile, Quantile Regression, Dynamic Quantile Model, Expected Shortfall

JEL Classification: G11, C13, C14, C22, C32

Suggested Citation

Hamidi, Benjamin and Maillet, Bertrand B. and Prigent, Jean-Luc, A Dynamic Autoregressive Expectile for Time-Invariant Portfolio Protection Strategies (September 10, 2009). Available at SSRN: https://ssrn.com/abstract=1343473 or http://dx.doi.org/10.2139/ssrn.1343473

Benjamin Hamidi (Contact Author)

Université Paris I Panthéon-Sorbonne - CES/CNRS ( email )

106 bv de l'Hôpital
Paris, 75013
France

Bertrand B. Maillet

EMLyon Business School (Paris Campus) ( email )

23 Avenue Guy de Collongue
Ecully, 69132
France

Jean-Luc Prigent

University of Cergy-Pontoise - ThEMA ( email )

33 boulevard du port
33 bd du Port
F-95011 Cergy CEDEX
France

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