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
Similarly, the lower TCE
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Supplementary Material
The online version of this article offers supplementary material (DOI: https://doi.org/10.1515/snde-2017-0012).
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