VALUE-AT-RISK ESTIMATION AND THE PORT MEAN-OF-ORDER-P METHODOLOGY

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Fernanda Figueiredo (Autor) FEP; Gomes, MI (Autor) Outra; Henriques Rodrigues, L (Autor) Outra

Revista

Título: Revstat Statistical Journal

Vol. 15 Nº 2

Páginas: 187-204

ISSN: 1645-6726

Editora: Instituto Nacional De Estatistica

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 2 Citações

Outras Informações

ID Authenticus: P-00M-SES

Abstract (EN): In finance, insurance and statistical quality control, among many other areas of application, a typical requirement is to estimate the value-at-risk (VaR) at a small level q, i.e. a high quantile of probability 1 q, a value, high enough, so that the chance of an exceedance of that value is equal to q, small. The semi-parametric estimation of high quantiles depends strongly on the estimation of the extreme value index (EVI), the primary parameter of extreme events. And most semi-parametric VaR-estimators do not enjoy the adequate behaviour, in the sense that they do not suffer the appropriate linear shift in the presence of linear transformations of the data. Recently, and for heavy tails, i.e. for a positive EVI, new VaR-estimators were introduced with such a behaviour, the so-called PORT VaR-estimators, with PORT standing for peaks over a random threshold. Regarding EVI-estimation, new classes of PORT-EVI estimators, based on a powerful generalization of the Hill EVI-estimator related to adequate mean of-order-p (MOp) EVI-estimators, were even more recently introduced. In this article, also for heavy tails, we introduce a new class of PORT-MOP VaR-estimators with the above mentioned behaviour, using the PORT-MOP class of EVI-estimators. Under convenient but soft restrictions on the underlying model, these estimators are consistent and asymptotically normal. The behaviour of the PORT-MOP VaR-estimators is studied for finite samples through Monte-Carlo simulation experiments.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 18