Recent Submissions

  • El sistema alimentario global: I - definición de un espacio 

    Clotet, Ramon; Colomer Xena, Yvonne; Jarauta Bragulat, Eusebio; Mayor Zaragoza, Federico (MINISTERIO DE AGRICULTURA, PESCA Y ALIMENTACION., 2013-10)
    Article
    Open Access
    Los autores desarrollan su modelo de sistema alimentario global, presentado conceptualmente en anteriores publicaciones, basado en cuatro ejes básicos (disponibilidad, economía, política y saber) dándole una estructura ...
  • Zero and coefficient inequalities for hyperbolic polynomials 

    Rubió Massegú, Josep; Díaz Barrero, José Luis; Rubio Díaz, Pedro (2006-03)
    Article
    Open Access
    In this paper using classical inequalities and Cardan-Viète formulae some inequalities involving zeroes and coefficients of hyperbolic polynomials are given. Furthermore, considering real polynomials whose zeros lie in ...
  • The normal distribution in some constrained sample spaces 

    Mateu Figueras, Gloria; Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José (2013-01-01)
    Article
    Open Access
    Phenomena with a constrained sample space appear frequently in practice. This is the case, for example, with strictly positive data, or with compositional data, such as percentages or proportions. If the natural measure ...
  • An improvement of Ostrowski root-finding method 

    Grau Sánchez, Miguel; Díaz Barrero, José Luis (2006-02)
    Article
    Restricted access - publisher's policy
    An improvement to the iterative method based on the Ostrowski one to compute nonlinear equation solutions, which increases the local order of convergence is suggested. The adaptation of a strategy presented here gives a ...
  • Wave height data assimilation using non-stationary kriging 

    Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín; Gómez Aguar, Jesús Javier (2011-03)
    Article
    Restricted access - publisher's policy
    Data assimilation into numerical models should be both computationally fast and physically meaningful, in order to be applicable in online environmental surveillance. We present a way to improve assimilation for computationally ...
  • Bayes linear spaces 

    Van den Boogaart, Karl Gerard; Egozcue Rubí, Juan José; Pawlowsky-Glahn, Vera (2010-12)
    Article
    Open Access
    Linear spaces consisting of $\sigma$-finite probability measures and infinite measures (improper priors and likelihood functions) are defined. The commutative group operation, called perturbation, is the updating given by ...
  • An experimental comparison of cokriging of regionalised compositional data using four different methods: case study3A Bauxites in Hungary-2 

    Jarauta Bragulat, Eusebio; Hervada Sala, Carme; Diblasi, Angela (2004-02-04)
    Article
    Restricted access - publisher's policy
    An important problem in the geosciences is the etimation or prediction or regionalized compositions. In fact, it is usual to deal with data such as percentages, concentrations, ppm,..., and use them to estimate values in ...
  • Climate change in a Point-Over-Threshold model: an example on ocean-wave-storm hazard in NE Spain 

    Tolosana Delgado, Raimon; Ortego Martínez, María Isabel; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín (2010-09-27)
    Article
    Open Access
    A reparametrization of the Generalized Pareto Distribution is here proposed. It is suitable to parsimoniously check trend assumptions within a Point-Over-Threshold model of hazardous events. This is based on considerations ...
  • Teaching and learning mathematics and statistics at an agricultural engineering school 

    Blanco Abellán, Mónica; Ginovart Gisbert, Marta; Estela Carbonell, M. Rosa; Jarauta Bragulat, Eusebio (2009)
    Article
    Open Access
  • Bayesian trend analysis for daily rainfall series of Barcelona 

    Ortego Martínez, María Isabel; Gibergans Baguena, José; Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Llasat Botija, Maria Carmen (2010-07-15)
    Article
    Open Access
    A Point-Over-Threshold approach using a reparameterization of the Generalized Pareto Distribution (GPD) has been used to assess changes in the daily rainfall Barcelona series (1854–2006). A Bayesian approach, considering ...

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