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Efficient estimation of financial risk by regressing the quantiles of parametric distributions: An application to CARR models

  • Jennifer So Kuen Chan EMAIL logo , Kok-Haur Ng , Thanakorn Nitithumbundit and Shelton Peiris ORCID logo
Published/Copyright: September 6, 2018

Abstract

Risk measures such as value-at-risk (VaR) and expected shortfall (ES) may require the calculation of quantile functions from quantile regression models. In a parametric set-up, we propose to regress directly on the quantiles of a distribution and demonstrate a method through the conditional autoregressive range model which has increasing popularity in recent years. Two flexible distribution families: the generalised beta type two on positive support and the generalised-t on real support (which requires log transformation) are adopted for the range data. Then the models are extended to allow the volatility dynamic and compared in terms of goodness-of-fit. The models are implemented using the module fmincon in Matlab under the classical likelihood approach and applied to analyse the intra-day high-low price ranges from the All Ordinaries index for the Australian stock market. Quantiles and upper-tail conditional expectations evaluated via VaR and ES respectively are forecast using the proposed models.

Acknowledgement

This work is partially supported by the UMRG grant no: RG260-13AFR of the University of Malaya. The second author acknowledged the support from the School of Mathematics and Statistics, The University of Sydney during his visit in 2017.

A Appendix

For the quantile regression model at level u using GB2 distribution and (22), the upper TCE ξut,ρu for ρ(0.5,1) at time t is

ξut,ρu=11ρρFGB21(r)dr=11ρFGB21(ρ|at,bt,p,q)yfGB2(y)dy=at(1ρ)B(p,q)FGB21(ρ|at,bt,p,q)(ybt)atp[1+(ybt)at]p+qdy=bt(1ρ)B(p,q)FGB21(ρ|at,bt,p,q)(yb)atpat+1[1+(ybt)at]p+q2atbt(ybt)at1[1+(ybt)at]2dy=btB(p+1at,q1at)(1ρ)B(p,q)FB1(ρ|p,q)zp1+1at(1z)q11atB(p+1at,q1at)dz=btB(p+1at,q1at)B(p,q)×1FB(FB1(ρ|p,q)|p+1at,q1at)1ρ=qut(1FB1(u|p,q)FB1(u|p,q))1atB(p+1at,q1at)B(p,q)×1FB(FB1(ρ|p,q)|p+1at,q1at)1ρ.

Similarly, the lower TCE ξut,ρl for ρ(0,0.5) at time t is

ξut,ρl=qut(1FB1(u|p,q)FB1(u|p,q))1atB(p+1at,q1at)B(p,q)×FB(FB1(ρ|p,q)|p+1at,q1at)ρ.

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Supplementary Material

The online version of this article offers supplementary material (DOI: https://doi.org/10.1515/snde-2017-0012).


Published Online: 2018-09-06

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