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Optimisation of coherent distortion risk measures
Thesis   Open access

Optimisation of coherent distortion risk measures

Leboea Mikiea Polinyane
MCom, University of Johannesburg
2026
Handle:
https://hdl.handle.net/10210/521356

Abstract

This dissertation addresses the optimisation of a class of risk measures referred to as coherent distortion risk measures (CDRMs) within the portfolio optimisation framework by leveraging linear programming techniques. The research was built upon the Conditional-Value-at-Risk (CVaR) methodology introduced by Rockafellar and Uryasev (2000) and extended Feng and Tan (2012) by incorporating the GlueVaR risk measure that was first introduced by Belles- Sampera et al. (2014a) into a broader Generalised GlueVaR framework. The study explored a range of established risk measures within the CDRM family, including CVaR, the Wang Transform (WT), the Proportional Hazard (PH), the Beta Transform (BT), and the Dual Power Transform (DP) risk measures. Empirical analyses and case studies were conducted to demonstrate the versatility of the linear programming method for solving the CDRM optimisation problem. The dissertation investigated how different CDRMs perform in real-world portfolio scenarios and provided insights into their comparative effectiveness in managing risk. By focusing on coherent distortion risk measures, the research highlighted their practical relevance for financial institutions aiming to balance return and risk under varying market conditions. The findings reinforced the significance of advanced risk measures in portfolio optimisation, particularly in achieving better risk-adjusted returns.
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