Elicitability and identifiability of tail risk measures
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914139518009344 |
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| author | Fissler, Tobias Liu, Fangda Wang, Ruodu Wei, Linxiao |
| author_facet | Fissler, Tobias Liu, Fangda Wang, Ruodu Wei, Linxiao |
| contents | Tail risk measures are fully determined by the distribution of the underlying loss beyond its quantile at a certain level, with Value-at-Risk, Expected Shortfall and Range Value-at-Risk being prime examples. They are induced by law-based risk measures, called their generators, evaluated on the tail distribution. This paper establishes joint identifiability and elicitability results of tail risk measures together with the corresponding quantile, provided that their generators are identifiable and elicitable, respectively. As an example, we establish the joint identifiability and elicitability of the tail expectile together with the quantile. The corresponding consistent scores constitute a novel class of weighted scores, nesting the known class of scores of Fissler and Ziegel for the Expected Shortfall together with the quantile. For statistical purposes, our results pave the way to easier model fitting for tail risk measures via regression and the generalized method of moments, but also model comparison and model validation in terms of established backtesting procedures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14136 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Elicitability and identifiability of tail risk measures Fissler, Tobias Liu, Fangda Wang, Ruodu Wei, Linxiao Statistical Finance Statistics Theory Risk Management Methodology 91G70, 62F07, 62G32, 62P05 Tail risk measures are fully determined by the distribution of the underlying loss beyond its quantile at a certain level, with Value-at-Risk, Expected Shortfall and Range Value-at-Risk being prime examples. They are induced by law-based risk measures, called their generators, evaluated on the tail distribution. This paper establishes joint identifiability and elicitability results of tail risk measures together with the corresponding quantile, provided that their generators are identifiable and elicitable, respectively. As an example, we establish the joint identifiability and elicitability of the tail expectile together with the quantile. The corresponding consistent scores constitute a novel class of weighted scores, nesting the known class of scores of Fissler and Ziegel for the Expected Shortfall together with the quantile. For statistical purposes, our results pave the way to easier model fitting for tail risk measures via regression and the generalized method of moments, but also model comparison and model validation in terms of established backtesting procedures. |
| title | Elicitability and identifiability of tail risk measures |
| topic | Statistical Finance Statistics Theory Risk Management Methodology 91G70, 62F07, 62G32, 62P05 |
| url | https://arxiv.org/abs/2404.14136 |