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Ayana, F., & Frederico C. (2013).  Comparing several tests of randomness based on the difference of observations. 809-812., Jan, Number 1558 Abstract

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Cabral, I., Caeiro F., & Gomes M. I. (2022).  On the comparison of several classical estimators of the extreme value index. Communications in Statistics - Theory and Methods. 51, 179-196., Number 1 Abstract
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Cabral, I., Caeiro F., & Gomes I. M. (2016).  Reduced bias Hill estimators. International Conference of Computational Methods in Sciences and Engineering 2016, ICCMSE 2016. 1790, , 2016/12/6: American Institute of Physics Inc. Abstract

For heavy tails, classical extreme value index estimators, like the Hill estimator, are usually asymptotically biased. Consequently those estimators are quite sensitive to the number of top order statistics used in the estimation. The recent minimum-variance reduced-bias extreme value index estimators enable us to remove the dominant component of asymptotic bias and keep the asymptotic variance of the new estimators equal to the asymptotic variance of the Hill estimator. In this paper a new minimum-variance reduced-bias extreme value index estimator is introduced, and its non degenerate asymptotic behaviour is studied. A comparison with another important minimum-variance reduced-bias extreme value index estimator is also provided.For heavy tails, classical extreme value index estimators, like the Hill estimator, are usually asymptotically biased. Consequently those estimators are quite sensitive to the number of top order statistics used in the estimation. The recent minimum-variance reduced-bias extreme value index estimators enable us to remove the dominant component of asymptotic bias and keep the asymptotic variance of the new estimators equal to the asymptotic variance of the Hill estimator. In this paper a new minimum-variance reduced-bias extreme value index estimator is introduced, and its non degenerate asymptotic behaviour is studied. A comparison with another important minimum-variance reduced-bias extreme value index estimator is also provided.

Cabral, I., Caeiro F., & Gomes I. M. (2016).  Redução do viés do estimador de Hill: uma nova abordagem. Estatística: Progressos e Aplicações. 73 - 84., 2016/11 Abstract
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Caeiro, F., & Gomes M. I. (2009).  Semi-parametric second-order reduced-bias high quantile estimation.. Test. 18, 392-413., Number 2 Abstract

{Summary: In many areas of application, like, for instance, climatology, hydrology, insurance, finance, and statistical quality control, a typical requirement is to estimate a high quantile of probability $1 - p$, a value high enough so that the chance of an exceedance of that value is equal to $p$, small. The semi-parametric estimation of high quantiles depends not only on the estimation of the tail index or extreme value index $\gamma $, the primary parameter of extreme events, but also on the adequate estimation of a scale first order parameter. Recently, apart from new classes of reduced-bias estimators for $\gamma >0$, new classes of the scale first order parameter have been introduced in the literature. Their use in quantile estimation enables us to introduce new classes of asymptotically unbiased high quantiles' estimators, with the same asymptotic variance as the (biased) ``classical'' estimator. The asymptotic distributional properties of the proposed classes of estimators are derived and the estimators are compared with alternative ones, not only asymptotically, but also for finite samples through Monte Carlo techniques. An application to the log-exchange rates of the Euro against the Sterling Pound is also provided.}

Caeiro, F., Gomes I. M., Beirlant J., & de Wet T. (2016).  Mean-of-order p reduced-bias extreme value index estimation under a third-order framework. ExtremesExtremes. 19(4), 561 - 589., 2016/12/1 AbstractWebsite

Reduced-bias versions of a very simple generalization of the ‘classical’ Hill estimator of a positive extreme value index (EVI) are put forward. The Hill estimator can be regarded as the logarithm of the mean-of-order-0 of a certain set of statistics. Instead of such a geometric mean, it is sensible to consider the mean-of-order-p (MOP) of those statistics, with p real. Under a third-order framework, the asymptotic behaviour of the MOP, optimal MOP and associated reduced-bias classes of EVI-estimators is derived. Information on the dominant non-null asymptotic bias is also provided so that we can deal with an asymptotic comparison at optimal levels of some of those classes. Large-scale Monte-Carlo simulation experiments are undertaken to provide finite sample comparisons.Reduced-bias versions of a very simple generalization of the ‘classical’ Hill estimator of a positive extreme value index (EVI) are put forward. The Hill estimator can be regarded as the logarithm of the mean-of-order-0 of a certain set of statistics. Instead of such a geometric mean, it is sensible to consider the mean-of-order-p (MOP) of those statistics, with p real. Under a third-order framework, the asymptotic behaviour of the MOP, optimal MOP and associated reduced-bias classes of EVI-estimators is derived. Information on the dominant non-null asymptotic bias is also provided so that we can deal with an asymptotic comparison at optimal levels of some of those classes. Large-scale Monte-Carlo simulation experiments are undertaken to provide finite sample comparisons.

Caeiro, F. A. G. G., Gomes I. M., & Henriques-Rodrigues L. (2016).  A location-invariant probability weighted moment estimation of the Extreme Value Index. International Journal of Computer Mathematics. 93(4), 676 - 695., 2016/4/2 AbstractWebsite

The peaks over random threshold (PORT) methodology and the Pareto probability weighted moments (PPWM) of the largest observations are used to build a class of location-invariant estimators of the Extreme Value Index (EVI), the primary parameter in statistics of extremes. The asymptotic behaviour of such a class of EVI-estimators, the so-called PORT-PPWM EVI-estimators, is derived, and an alternative class of location-invariant EVI-estimators, the generalized Pareto probability weighted moments (GPPWM) EVI-estimators is considered as an alternative. These two classes of estimators, the PORT-PPWM and the GPPWM, jointly with the classical Hill EVI-estimator and a recent class of minimum-variance reduced-bias estimators are compared for finite samples, through a large-scale Monte-Carlo simulation study. An adaptive choice of the tuning parameters under play is put forward and applied to simulated and real data sets.The peaks over random threshold (PORT) methodology and the Pareto probability weighted moments (PPWM) of the largest observations are used to build a class of location-invariant estimators of the Extreme Value Index (EVI), the primary parameter in statistics of extremes. The asymptotic behaviour of such a class of EVI-estimators, the so-called PORT-PPWM EVI-estimators, is derived, and an alternative class of location-invariant EVI-estimators, the generalized Pareto probability weighted moments (GPPWM) EVI-estimators is considered as an alternative. These two classes of estimators, the PORT-PPWM and the GPPWM, jointly with the classical Hill EVI-estimator and a recent class of minimum-variance reduced-bias estimators are compared for finite samples, through a large-scale Monte-Carlo simulation study. An adaptive choice of the tuning parameters under play is put forward and applied to simulated and real data sets.

Caeiro, F. (2003).  Redução de viés em estimadores do índice de cauda. Actas do X Congresso Anual da SPE - “Literacia e Estatística”. 187-199., Porto, Portugalspe2002_187-199.pdf
Caeiro, F., & Gomes M. I. (2006).  Estimação de quantis elevados em estatística de extremos. Actas do XIII Congresso Anual da Sociedade Portuguesa de Estatística - "Ciência Estatística". 217-228.2006spe217-228.pdf
Caeiro, F., & Gomes D. S. R. P. (2015).  Adaptive estimation of a tail shape second order parameter. International Conference of Computational Methods in Sciences and Engineering 2015 (ICCMSE 2015). , 2015/12/31: American Institute of Physics Inc. Abstract

In Statistics of Extremes, the tail shape second order parameter is a relevant parameter whenever we want to improve the estimation of first order parameters. We shall consider two semi-parametric estimators of the shape second order parameter, parameterized with a tuning parameter. We provide a Monte Carlo comparative simulation study of several algorithms for the choice of such tuning parameter and for an adaptive estimation of the shape second order parameter.In Statistics of Extremes, the tail shape second order parameter is a relevant parameter whenever we want to improve the estimation of first order parameters. We shall consider two semi-parametric estimators of the shape second order parameter, parameterized with a tuning parameter. We provide a Monte Carlo comparative simulation study of several algorithms for the choice of such tuning parameter and for an adaptive estimation of the shape second order parameter.

Caeiro, F., Henriques-Rodrigues L. {\'ı}gia, & Gomes I. M. (2022).  The Use of Generalized Means in the Estimation of the Weibull Tail Coefficient. (Anil Kumar, Ed.).Computational and Mathematical Methods. 2022, 1–12., jun: Hindawi Limited AbstractWebsite
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Caeiro, F., Cabral I., & Gomes I. M. (2018).  Improving Asymptotically Unbiased Extreme Value Index Estimation. Contributions to Statistics. 155–163.: Springer International Publishing Abstract
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Caeiro, F., & Gomes I. M. (2002).  A class of asymptotically unbiased semi-parametric estimators of the tail index.. Test. 11, 345-364., Number 2 Abstract

{Summary: We consider a class of consistent semi-parametric estimators of a positive tail index $\gamma$, parameterized by a tuning or control parameter $\alpha$. Such a control parameter enables us to have access, for any available sample, to an estimator of $\gamma$ with a null dominant component of asymptotic bias, and with a reasonably flat mean squared error pattern, as a function of $k$, the number of top order statistics considered. Moreover, we are able to achieve a high efficiency relative to the classical Hill estimator [ıt B. M. Hill}, Ann. Stat. 3, 1163–1174 (1975; Zbl 0323.62033)], provided we may have access to a larger number of top order statistics than the number needed for optimal estimation through the Hill estimator.}

Caeiro, F., & Gomes M. I. (2011).  Probability weighted moments bootstrap estimation: a case study in the field of insurance. Risk and Extreme Values in Insurance and Finance: Book of Abstracts. 27-30., Lisbon: CEAULrev2011_caeiro_gomes.pdf
Caeiro, F., Henriques-Rodrigues L. {\'ı}gia, & Gomes D. P. (2019).  A simple class of reduced bias kernel estimators of extreme value parameters. Computational and Mathematical Methods. e1025., apr: Wiley AbstractWebsite
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Caeiro, F., & Gomes M. I. (2006).  A new class of estimators of a ``scale'' second order parameter.. Extremes. 9, 193-211., Number 3-4 Abstract

{Let $X_i$ be i.i.d. r.v.s with heavy-tailed CDF $F(x)$ such that $$1-F(x)=(x/C)^{-1/\gamma}((1+(\beta/\rho)(x/C)^{\rho/\gamma} +\beta'(x/C)^{2\rho/\gamma}(1+o(1))),$$ where $\gamma$ is the tail index ($\gamma>0$), and $\rho<0$ and $\beta$ are the ``second order parameters''. The authors construct an estimator for $\beta$ based on the ``tail moments'' $$M_n^{(\alpha)}=(k)^{-1}\sum_{i=1}^k [łog X_{n-i+1:n}-łog X_{n-k:n}]^\alpha. $$ Consistency and asymptotic normality of the estimator are demonstrated. The small sample properties of the estimator are investigated via simulations.}

Caeiro, F., & Mateus A. (2023).  A New Class of Generalized Probability-Weighted Moment Estimators for the Pareto Distribution. Mathematics. 11, 1076., feb, Number 5: {MDPI} {AG} AbstractWebsite
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Caeiro, F., Gomes M. I., & Rodrigues L. H. (2009).  Reduced-bias tail index estimators under a third-order framework.. Commun. Stat., Theory Methods. 38, 1019-1040., Number 7 Abstract

{Summary: We are interested in the comparison, under a third-order framework, of classes of second-order, reduced-bias tail index estimators, giving particular emphasis to minimum-variance reduced-bias estimators of the tail index $\gamma$. The full asymptotic distributional properties of the proposed classes are derived under a third-order framework and the estimators are compared with other alternatives, not only asymptotically, but also for finite samples through Monte Carlo techniques. An application to the log-exchange rates of the Euro against the USA Dollar is also provided.}

Caeiro, F., & Gomes M. I. (2014).  On the bootstrap methodology for the estimation of the tail sample fraction. COMPSTAT 2014: 21th International Conference on Computational Statistics. 546-553., Genevecaeiro_gomes_compstat2014_reprint.pdf
Caeiro, F., Marques F. J., Mateus A., & Atal S. (2016).  A note on the Jackson exponentiality test. International Conference of Computational Methods in Sciences and Engineering 2016, ICCMSE 2016. 1790, , 2016/12/6: American Institute of Physics Inc. Abstract

In this paper we revisit the Jackson exponentiality test. We study and provide functions in R language to compute theoretical moments, the distribution function and quantiles of the statistic test. Approximations to the exact distribution function and quantiles are also provided and their precision discussed. In addition, we provide an application of the Jackson test to real data.In this paper we revisit the Jackson exponentiality test. We study and provide functions in R language to compute theoretical moments, the distribution function and quantiles of the statistic test. Approximations to the exact distribution function and quantiles are also provided and their precision discussed. In addition, we provide an application of the Jackson test to real data.

Caeiro, F., & Gomes M. I. (2011).  Semi-parametric tail inference through probability-weighted moments.. J. Stat. Plann. Inference. 141, 937-950., Number 2 Abstract

{Summary: For heavy-tailed models, and working with the sample of the $k$ largest observations, we present probability weighted moments (PWM) estimators for the first order tail parameters. Under regular variation conditions on the right-tail of the underlying distribution function $F$ we prove the consistency and asymptotic normality of these estimators. Their performance, for finite sample sizes, is illustrated through a small-scale Monte Carlo simulation.}

Caeiro, F., & Gomes M. I. (2008).  Caudas pesadas: t de Student e variante assimétrica versus metodologia semi-paramétrica.. Actas do XV Congresso Anual da Sociedade Portuguesa de Estatística - “Da Teoria à Prática”. 127-136., Lisboaart053.pdf
Caeiro, F. (2015).  Preface of the "2nd Symposium on Computational Statistical Methods". AIP Conference ProceedingsAIP Conference Proceedings. 1702, , 2015/12/31 AbstractWebsite
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