Maria Manuela Neves

Prof. Maria Manuela Neves

orcid

Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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23 June 2009 in American Journal of Gastroenterology
Verified
Journal Article
Closed access
Catarina Sousa GuerreiroCatarina Sousa Guerreiro
Catarina Sousa Guerreiro
PFPaula Ferreira
Paula Ferreira
LTLourdes Tavares
Lourdes Tavares
PSPaula Moura Santos
Paula Moura Santos
MNMaria Manuela Neves
Maria Manuela Neves
MCMarília Cravo
Marília Cravo
The American Journal of Gastroenterology is published by Nature Publishing Group (NPG) on behalf of the American College of Gastroenterology (ACG). Ranked the #1 clinical journal covering gastroenterology and hepatology*, The American Journal of Gastroenterology (AJG) provides practical and professional support for clinicians dealing with the gastroenterological disorders seen most often in patients. Published with practicing clinicians in mind, the journal aims to be easily accessible, organizing its content by topic, both online and in print. www.amjgastro.com, *2007 Journal Citation Report (Thomson Reuters, 2008)

22 December 2011 in Extremes
Verified
Journal Article
Closed access
PDF file
Maria Ivette GomesMaria Ivette Gomes
Maria Ivette Gomes
FFFernanda Figueiredo
Fernanda Figueiredo
MNMaria Manuela Neves
Maria Manuela Neves

7 July 2014 in Journal of Statistical Theory and Practice
Verified
Journal Article
Closed access
MNMaria Manuela Neves
Maria Manuela Neves
Maria Ivette GomesMaria Ivette Gomes
Maria Ivette Gomes
FFFernanda Figueiredo
Fernanda Figueiredo
DGDora Gomes
Dora Gomes
When modeling extreme events, there are a few primordial parameters, among which we refer to the extreme value index (EVI) and the extremal index (EI). Under a framework related to large values, the EVI measures the right tail weight of the underlying distribution and the EI characterizes the degree of local dependence in the extremes of a stationary sequence. Most of the semiparametric estimators of these parameters show the same type of behavior: nice asymptotic properties but a high variance for small values of k, the number of upper order statistics used in the estimation, and a high bias for large values of k. This brings a real need for the choice of k. Choosing some well-known estimators of those two parameters, we revisit the application of a heuristic algorithm for the adaptive choice of k. A simulation study illustrates the performance of the proposed algorithm.

21 February 2013 in Communications in Statistics - Theory and Methods
Verified
Journal Article
Closed access
Maria Ivette GomesMaria Ivette Gomes
Maria Ivette Gomes
MMMaria João Martins
Maria João Martins
MNMaria Manuela Neves
Maria Manuela Neves
In this article, we revisit the importance of the generalized jackknife in the construction of reliable semi-parametric estimates of some parameters of extreme or even rare events. The generalized jackknife statistic is applied to a minimum-variance reduced-bias estimator of a positive extreme value index—a primary parameter in statistics of extremes. A couple of refinements are proposed and a simulation study shows that these are able to achieve a lower mean square error. A real data illustration is also provided.

1 January 2011 in Procedia Environmental Sciences
Verified
Journal Article
Open access
MNMaria Manuela Neves
Maria Manuela Neves
DGDora Gomes
Dora Gomes
Spatial statistics deals with statistical methods in which spatial locations play an explicit role in the analysis of data. Spatial data are often modeled as a realization of a Gaussian process or a function of a Gaussian process. However there are events, such as rain, snow, storms, hurricanes, earthquakes, where extremes are of the main interest. Here multivariate normal distributions are inappropriate for modeling tail behavior. The natural class of processes for dealing with extremes is the max-stable processes. This work briefly reviews the approaches to the statistical modeling of spatial extremes. Models for max-stable processes will be considered in an application to the annual maxima of daily precipitation over the North of Portugal

19 October 2007 in Metrika
Verified
Journal Article
Closed access
PDF file
JSJosé António Santos
José António Santos
MNMaria Manuela Neves
Maria Manuela Neves