Now showing items 157-176 of 213

    • Parametric Estimation of Diffusion Processes: A Review and Comparative Study 

      López Pérez, Alejandra María; Febrero Bande, Manuel; González Manteiga, Wenceslao (MDPI, 2021)
      This paper provides an in-depth review about parametric estimation methods for stationary stochastic differential equations (SDEs) driven by Wiener noise with discrete time observations. The short-term interest rate dynamics ...
    • Periodic solutions for some phi-Laplacian and reflection equations 

      Cabada Fernández, Alberto; Fernández Tojo, Fernando Adrián (Springer International Publishing, 2016-02-29)
      This work is devoted to the study of the existence and periodicity of solutions of initial differential problems, paying special attention to the explicit computation of the period. These problems are also connected with ...
    • Permanence and Periodic Solution of Predator-Prey System with Holling Type Functional Response and Impulses 

      Wang, Weibing; Shen, Jianhua; Nieto Roig, Juan José (Hindawi, 2007)
      We considered a nonautonomous two dimensional predator-prey system with impulsive effect. Conditions for the permanence of the system and for the existence of a unique stable periodic solution are obtained.
    • A perspectiva de xénero na planificación da actividade estatística na Comunidade Autónoma de Galicia 

      Touriño Sánchez, Ana; Villar Cheda, Estefanía; Iglesias Patiño, Carlos Luis (Universidade de Santiago de Compostela, 2010)
      O propósito deste artigo é referir o estado da cuestión polo que respecta á integración da perspectiva de xénero nas estatísticas oficiais na Comunidade galega a través da revisión da planificación estatística. Este ...
    • A plug-in bandwidth selector for nonparametric quantile regression 

      Conde Amboage, Mercedes; Sánchez Sellero, César Andrés (Springer, 2018)
      In the framework of quantile regression, local linear smoothing techniques have been studied by several authors, particularly by Yu and Jones (J Am Stat Assoc 93:228–237, 1998). The problem of bandwidth selection was ...
    • Polynomial volume estimation and its applications 

      Cuevas González, Antonio; Pateiro López, Beatriz (Elsevier, 2018)
      Given a compact set S ⊂ R d we consider the problem of estimating, from a random sample of points, the Lebesgue measure of S, µ(S), and its boundary measure, L(S) (as defined by the Minkowski content of ∂S). This topic ...
    • A positive fixed point theorem with applications to systems of Hammerstein integral equations 

      Cabada Fernández, Alberto; Cid Araújo, José Ángel; Infante, Gennaro (Springer, 2014)
      We present new criteria on the existence of fixed points that combine some monotonicity assumptions with the classical fixed point index theory. As an illustrative application, we use our theoretical results to prove the ...
    • Positive periodic solutions for impulsive differential equations with infinite delay and applications to integro‐differential equations 

      Buedo Fernández, Sebastián; Faria, Teresa (Wiley, 2020)
      Sufficient conditions for the existence of at least one positive periodic solution are established for a family of scalar periodic differential equations with infinite delay and nonlinear impulses. Our criteria, obtained ...
    • Positive solutions for discontinuous systems via a multivalued vector version of Krasnosel’skiĭ’s fixed point theorem in cones 

      López Pouso, Rodrigo; Precup, Radu; Rodríguez López, Jorge (MDPI, 2019)
      We establish the existence of positive solutions for systems of second–order differential equations with discontinuous nonlinear terms. To this aim, we give a multivalued vector version of Krasnosel’ski˘ı’s fixed point ...
    • Positive solutions for second-order boundary-value problems with sign changing Green's functions 

      Cabada Fernández, Alberto; Enguiça, Ricardo; López Somoza, Lucía (Texas State University, 2017)
      In this article we analyze some possibilities of finding positive solutions for second-order boundary-value problems with the Dirichlet and periodic boundary conditions, for which the corresponding Green's functions change ...
    • Positive solutions for φ-Laplacian equations with discontinuous state-dependent forcing terms 

      Precup, Radu; Rodríguez López, Jorge (Vilnius University Press, 2019)
      This paper concerns the existence, localization and multiplicity of positive solutions for a -Laplacian problem with a perturbed term that may have discontinuities in the state variable. First, the initial discontinuous ...
    • Post-operative stress hyperglycemia is a predictor of mortality in liver transplantation 

      Giráldez, Elena; Varo, Evaristo; Guler, Ipek; Cadarso Suárez, Carmen María; Tomé Martínez de Rituerto, Santiago; Barral, Patricia; Garrote, Antonio; Gude Sampedro, Francisco (BMC, 2018)
      A significant association is known between increased glycaemic variability and mortality in critical patients. To ascertain whether glycaemic profiles during the first week after liver transplantation might be associated ...
    • Power-series solution of compartmental epidemiological models 

      Srivastava, Hari M.; Area Carracedo, Iván Carlos; Nieto Roig, Juan José (AIMS Press, 2021)
      In this work, power-series solutions of compartmental epidemiological models are used to provide alternate methods to solve the corresponding systems of nonlinear differential equations. A simple and classical SIR compartmental ...
    • Predicting Malaria Transmission Dynamics in Dangassa, Mali: A Novel Approach Using Functional Generalized Additive Models 

      Ateba, François Freddy; Febrero Bande, Manuel; Sagara, Issaka; Sogoba, Nafomon; Touré, Mahamoudou; Sanogo, Daouda; Diarra, Ayouba; Ngitah, Andoh Magdalene; Winch, Peter J.; Shaffer, Jeffrey G.; Krogstad, Donald J.; Marker, Hannah C.; Gaudart, Jean; Doumbia, Seydou (MDPI, 2020)
      Mali aims to reach the pre-elimination stage of malaria by the next decade. This study used functional regression models to predict the incidence of malaria as a function of past meteorological patterns to better prevent ...
    • Predicting seasonal influenza transmission using functional regression models with temporal dependence 

      Oviedo de la Fuente, Manuel; Febrero Bande, Manuel; Muñoz Gracia, María del Pilar; Domínguez García, Ángela (Public Library of Science, 2018-04-25)
      This paper proposes a novel approach that uses meteorological information to predict the incidence of influenza in Galicia (Spain). It extends the Generalized Least Squares (GLS) methods in the multivariate framework to ...
    • Predicting trace gas concentrations using quantile regression models 

      Conde Amboage, Mercedes; González Manteiga, Wenceslao; Sánchez Sellero, César Andrés (Springer, 2017)
      Quantile regression methods are evaluated for computing predictions and prediction intervals of NOx concentrations measured in the vicinity of the power plant in As Pontes (Spain). For these data, smaller prediction errors ...
    • Presmoothing in functional linear regression 

      Ferraty, Frédéric; González Manteiga, Wenceslao; Martínez Calvo, Adela; Vieu, Philippe (Academia Sinica, Institute of Statistical Science, 2012)
      In this paper, we consider the functional linear model with scalar response, and explanatory variable valued in a function space. In recent literature, functional principal components analysis (FPCA) has been used to ...
    • Quantile regression: estimation and lack-of-fit tests 

      Conde Amboage, Mercedes; González Manteiga, Wenceslao; Sánchez Sellero, César Andrés (Sociedad de Estadística e Investigación Operativa, 2018)
      Although mean regression achieved its greatest diffusion in the twentieth century, it is very surprising to observe that the ideas of quantile regression appeared earlier. While the beginning of the least-squares regression ...
    • R implementation of a polyhedral approximation to a 3D set of points using the α-shape 

      Lafarge, Thomas; Pateiro López, Beatriz; Possolo, Antonio; Dunkers, Joy P. (American Statistical Association, 2014-01)
      This work presents the implementation in R of the α-shape of a nite set of points in the three-dimensional space R3. This geometric structure generalizes the convex hull and allows to recover the shape of non-convex and ...
    • Real-time predictive seasonal influenza model in Catalonia, Spain 

      Basile, Luca; Oviedo de la Fuente, Manuel; Torner, Nuria; Martínez, Ana I.; Jané, Mireia (Public Library of Science, 2018-05-07)
      Influenza surveillance is critical to monitoring the situation during epidemic seasons and predictive mathematic models may aid the early detection of epidemic patterns. The objective of this study was to design a real-time ...





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